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A151521 Number of 2-sided strip polytans with n cells. 0
1, 3, 4, 13, 25 (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: A026700 A187775 A295955 * A142860 A111954 A192872

Adjacent sequences:  A151518 A151519 A151520 * A151522 A151523 A151524

KEYWORD

nonn,hard,more

AUTHOR

Ed Pegg Jr, May 13 2009

STATUS

approved

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Last modified August 10 12:39 EDT 2020. Contains 336379 sequences. (Running on oeis4.)