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URL: https://oeis.org/A126202

⇱ A126202 - OEIS

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A126202
Number of pointed polyominoes with n cells.
4
1, 1, 1, 4, 12, 46, 172, 689, 2763, 11241, 45706, 186346, 759375, 3095191, 12610825, 51370336, 209194923, 851712069, 3466881944
OFFSET
0,4
COMMENTS
Number of pairs (P,C), where P is a polyomino with n cells (cf. A000105) and C runs through the orbit representatives of cells in P under the automorphism group of P.
EXAMPLE
a(4) = 12: polyomino and number of orbits on points:
XXXX..XXX..XXX..XX...XX
......X.....X....XX..XX
(2)...(4)..(3)..(2)..(1): total 12
CROSSREFS
KEYWORD
nonn,nice,more
AUTHOR
STATUS
approved