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A176673 Partial sums of A001168. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Partial sums of number of fixed polyominoes with n cells. The subsequence of primes in this partial sum begins: 3, 307, 2595167.

LINKS

Table of n, a(n) for n=1..25.

FORMULA

a(n) = SUM[i=1..n] A001168(i).

EXAMPLE

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

CROSSREFS

Cf. A001168, A000105, A006746, A056877, A006748, A056878, A006747, A006749, A006884, A006885, A006877, A006878, A033492, 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

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Last modified July 14 10:04 EDT 2020. Contains 335721 sequences. (Running on oeis4.)