

A359068


Number of 1sided strip polyominoes with n cells.


4



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

1,3


COMMENTS

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:
###
# #
##


LINKS



PROG

(C++) // see Links section


CROSSREFS

A333313 gives the number of free (2sided) 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.


KEYWORD

nonn,more


AUTHOR



STATUS

approved



