A143158 - OEIS

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A143158

Triangle read by rows, T(n,k) = Sum_{j=k..n} mu(j).

2

1, 0, -1, -1, -2, -1, -1, -2, -1, 0, -2, -3, -2, -1, -1, -1, -2, -1, 0, 0, 1, -2, -3, -2, -1, -1, 0, -1, -2, -3, -2, -1, -1, 0, -1, 0, -2, -3, -2, -1, -1, 0, -1, 0, 0, -1, -2, -1, 0, 0, 1, 0, 1, 1, 1, -2, -3, -2, -1, -1, 0, -1, 0, 0, 0, -1, -2, -3, -2, -1, -1, 0, -1, 0, 0, 0, -1, 0, -3, -4, -3, -2, -2, -1, -2, -1, -1, -1, -2, -1, -1, -2, -3, -2, -1

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,5

COMMENTS

Right border gives A008683.

Left border gives A002321.

Row sums give A068340.

LINKS

Reinhard Zumkeller, Rows n = 1..125 of triangle, flattened

FORMULA

Triangle read by rows, T(n,k) = Sum_{j=k..n} mu(j), where mu(n) = A008683.

T(n, k) = A000012(n) * (A008683(n) * 0^(n-k)) * A000012(n).

EXAMPLE

First few rows of the triangle =

1;

0, -1;

-1, -2, -1;

-1, -2, -1, 0;

-2, -3, -2, -1, -1;

-2, -3, -2, -1, -1, 0, -1;

-2, -3, -2, -1, -1, 0, -1, 0;

-1, -2, -1, 0, 0, 1, 0, 1, 1, 1;

...

For example, T(5,3) = (-2) = Sum(-1, 0, -1), since mu(n) = 1, -1, -1, 0, -1, ...

MATHEMATICA

Table[Sum[MoebiusMu@ j, {j, k, n}], {n, 14}, {k, n}] // Flatten (* Michael De Vlieger, Dec 17 2015 *)

PROG

(Haskell)

import Data.List (tails)

a143158 n k = a143158_tabl !! (n-1) !! (k-1)

a143158_row n = a143158_tabl !! (n-1)

a143158_tabl = map (map sum . init . tails) a054527_tabl

-- Reinhard Zumkeller, Sep 04 2015

(PARI) T(n, k) = sum(j=k, n, moebius(j))

CROSSREFS

Cf. A008683, A002321, A068340, A054527.

Sequence in context: A364312 A307016 A375383 * A336708 A308424 A317489

Adjacent sequences: A143155 A143156 A143157 * A143159 A143160 A143161

KEYWORD

AUTHOR

Gary W. Adamson, Jul 27 2008

EXTENSIONS

47th term = T(10,2) corrected by Reinhard Zumkeller, Sep 04 2015

STATUS

approved