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A359068
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Number of 1-sided strip polyominoes with n cells.
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4
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1, 1, 2, 5, 10, 24, 52, 124, 282, 668, 1548, 3654, 8533, 20093, 47033, 110533, 258807, 607227, 1421055, 3329585, 7785995, 18221563, 42575336, 99539106, 232398659, 542864111, 1266567155, 2956342341, 6893180336, 16078817198, 37469245219, 87347384305, 203447081205
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OFFSET
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1,3
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COMMENTS
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A "strip" polyomino is a snake polyomino (A151514) with no holes.
This sequence first differs from A151514 at n = 7. An example of a polyomino counted by A151514, but not by this sequence, is:
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# #
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LINKS
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PROG
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(C++) // see Links section
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CROSSREFS
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A333313 gives the number of free (2-sided) strip polyominoes with n cells. Subtracting A333313 from A359068 gives the number of chiral pairs.
Subtracting A359068 from A151514 gives the number of snake polyominoes with n cells that have at least one hole.
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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