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A151524
Number of 2-sided strip polyrhombs with n cells.
4
1, 1, 3, 5, 12, 24, 58, 126, 300, 686, 1630, 3792, 8983, 21051, 49776, 116858, 275789, 647573, 1525847, 3580673, 8424978, 19755938, 46426810
OFFSET
1,3
LINKS
Eric Weisstein's World of Mathematics, Polyrhomb
CROSSREFS
Sequence in context: A090345 A186334 A303587 * A030270 A129757 A135019
KEYWORD
nonn,hard,more
AUTHOR
Ed Pegg Jr, May 13 2009
EXTENSIONS
a(15)-a(23) from Joseph Myers, Nov 22 2010
STATUS
approved