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Search: id:A126202
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| A126202 |
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Number of pointed polyominoes with n cells. |
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+0
1
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| 1, 1, 1, 4, 12, 46, 172, 689, 2763, 11241, 45706, 186346, 759375, 3095191, 12610825, 51370336, 209194923, 851712069, 3466881944
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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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.
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EXAMPLE
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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
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CROSSREFS
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Cf. A000105.
Sequence in context: A149370 A149371 A149372 this_sequence A149373 A151464 A101225
Adjacent sequences: A126199 A126200 A126201 this_sequence A126203 A126204 A126205
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KEYWORD
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nonn,nice
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AUTHOR
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David Applegate (david(AT)research.att.com) and N. J. A. Sloane (njas(AT)research.att.com), Mar 09 2007
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