A086815 - OEIS

A086815

a(n)=(n-1)*n^(2*n)

0, 16, 1458, 196608, 39062500, 10883911680, 4069338437094, 1970324836974592, 1200757082375992968, 900000000000000000000, 814027493868397611133210, 874465319237299285467856896, 1100799962319223399900795392108

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OFFSET

1,2

COMMENTS

(-1)*determinant of the 2n X 2n matrix M_(i,j)=j if (i+j) is multiple of n, M_(i,j)=i otherwise.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

For n=3 the matrix is : [1 2 1 1 5 1], [1 2 2 4 2 2], [3 3 3 3 3 6], [4 2 4 4 5 4], [1 5 5 4 5 5], [6 6 3 6 6 6]

MATHEMATICA

Table[(n-1)n^(2n), {n, 20}] (* Harvey P. Dale, Jul 23 2013 *)

PROG

(PARI) a(n)=(n-1)*n^(2*n)

CROSSREFS

Cf. A062206.

Sequence in context: A263975 A193128 A223101 * A302116 A294163 A180504

Adjacent sequences: A086812 A086813 A086814 * A086816 A086817 A086818

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Aug 06 2003

STATUS

approved