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A151521
Number of 2-sided strip polytans with n cells.
1
1, 3, 4, 13, 25, 72, 166, 450, 1124, 2973, 7603, 19865, 51199, 132982, 343290, 888309, 2292325, 5918742, 15258937, 39329418
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Polytan
CROSSREFS
Sequence in context: A187775 A377310 A295955 * A142860 A111954 A192872
KEYWORD
nonn,hard,more
AUTHOR
Ed Pegg Jr, May 13 2009
EXTENSIONS
a(6)-a(20) from John Mason, Jan 07 2022
STATUS
approved