login
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
OFFSET
1,4
LINKS
Eric Weisstein's World of Mathematics, Polyiamond
CROSSREFS
Sequence in context: A232801 A357238 A056514 * A219043 A342570 A050163
KEYWORD
nonn,hard,more
AUTHOR
Ed Pegg Jr, May 13 2009
EXTENSIONS
a(21)-a(30) from Joseph Myers, Nov 27 2010
STATUS
approved