A176673 - OEIS

A176673

Partial sums of A001168.

1, 3, 9, 28, 91, 307, 1067, 3792, 13702, 50148, 185416, 691277, 2595167, 9800041, 37194707, 141787644, 542583488, 2083404030, 8024142706, 30988922366, 119972435149, 465505007827, 1809877343351, 7049866113619, 27507668129630

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OFFSET

1,2

COMMENTS

Partial sums of number of fixed polyominoes with n cells, for n > 0.

LINKS

John Mason, Table of n, a(n) for n = 1..56

FORMULA

a(n) = Sum_{i=1..n} A001168(i).

EXAMPLE

a(6) = 1 + 2 + 6 + 19 + 63 + 216 = 307.

CROSSREFS

Cf. A001168, A000105, A006746, A056877, A006748, A056878, A006747, A006749, A006762.

Sequence in context: A071748 A071752 A071756 * A215007 A105849 A243156

Adjacent sequences: A176670 A176671 A176672 * A176674 A176675 A176676

KEYWORD

nonn

AUTHOR

Jonathan Vos Post, Apr 23 2010

STATUS

approved