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A151517 Number of 1-sided strip polyiamonds with n cells. 0
1, 1, 1, 3, 4, 9, 13, 28, 44, 88, 149, 283, 494, 920, 1633, 3004, 5382, 9814, 17660, 32058, 57809, 104630, 188800, 341027, 615401, 1110062, 2002521, 3608523, 6506635, 11715740 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..30.

Ed Pegg, Jr., Illustrations of polyforms

Eric Weisstein's World of Mathematics, Polyiamond

CROSSREFS

Sequence in context: A244703 A232801 A056514 * A219043 A050163 A207016

Adjacent sequences:  A151514 A151515 A151516 * A151518 A151519 A151520

KEYWORD

nonn,hard,more

AUTHOR

Ed Pegg Jr, May 13 2009

EXTENSIONS

a(21)-a(30) from Joseph Myers, Nov 27 2010

STATUS

approved

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Last modified August 10 12:19 EDT 2020. Contains 336379 sequences. (Running on oeis4.)