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A151520 Number of 1-sided strip polytans with n cells. 0
1, 4, 6, 21, 47 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..5.

Ed Pegg, Jr., Illustrations of polyforms

Eric Weisstein's World of Mathematics, Polytan

CROSSREFS

Sequence in context: A019147 A026722 A229743 * A282517 A227249 A002270

Adjacent sequences:  A151517 A151518 A151519 * A151521 A151522 A151523

KEYWORD

nonn,hard,more

AUTHOR

Ed Pegg Jr, May 13 2009

STATUS

approved

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Last modified August 22 03:23 EDT 2017. Contains 290942 sequences.