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A263677
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Irregular table read by rows, n >= 1, k >= 0: T(n,k) is the number of binary symmetric n X n matrices with k holes that are squares, where the axes of symmetry are horizontal and vertical.
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1
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1, 1, 3, 1, 3, 1, 28, 15, 11, 0, 6, 3, 30, 16, 0, 0, 3, 3
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OFFSET
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1,3
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COMMENTS
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Inspired by A258643 but the axes of symmetry are the same as in A262742. The mirror patterns and nonsquare holes are excluded.
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LINKS
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EXAMPLE
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Irregular table begins:
n\k 0 1 2 3 4 5 ...
1 1
2 1
3 3 1
4 3 1
5 28 15 11 0 6 3
6 30 16 0 0 3 3
...
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CROSSREFS
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KEYWORD
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nonn,tabf,more
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AUTHOR
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STATUS
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approved
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