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A067015
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Triangle T(n,k) (n>=1, rows have irregular lengths) giving number of arrangements of k nonattacking princes on an n X n staggered hexagonal torus board.
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1
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1, 1, 4, 1, 9, 9, 3, 1, 16, 72, 96, 32, 1, 25, 225, 910, 1695, 1355, 440, 70, 5, 1, 36, 522, 3936, 16659, 39996, 52860, 36108, 11871, 1960, 270, 36, 3, 1, 49, 1029, 12166, 89551, 429058, 1361619, 2864113, 3946208, 3481835, 1904833, 621026, 116060, 12285, 693, 7
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| A partition function for the staggered grid torus.
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EXAMPLE
| 1; 1,4; 1,9,9,3; 1,16,72,96,32; 1,25,225,910,1695,1355,440,70,5; ...
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CROSSREFS
| Row sums give A066865.
Sequence in context: A137615 A021990 A084887 * A158199 A091885 A069606
Adjacent sequences: A067012 A067013 A067014 * A067016 A067017 A067018
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KEYWORD
| tabf,nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Feb 17 2002
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