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A131467 Number of planar polyhexes (A000228) with at most n cells. 1
1, 2, 5, 12, 34, 116, 449, 1897, 8469, 38959, 182511, 865612, 4140438, 19937335, 96519210, 469387311, 2291623939, 11226534301, 55165698564, 271816734576, 1342610043518 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Partial sums of A000228 = number of hexagonal polyominoes (or planar polyhexes) with n cells.

Sequence in context: A151408 A121956 A176638 * A000103 A101292 A181899

Adjacent sequences:  A131464 A131465 A131466 * A131468 A131469 A131470

KEYWORD

nonn

AUTHOR

Tanya Khovanova, Jul 26 2007

STATUS

approved

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Last modified December 4 02:18 EST 2020. Contains 338921 sequences. (Running on oeis4.)