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A057151
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Number of square binary matrices with n ones, with no zero rows or columns, up to row and column permutation.
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4
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1, 1, 2, 4, 8, 18, 41, 102, 252, 666, 1789, 5031, 14486, 43280, 132777, 420267, 1366307, 4566966, 15661086, 55081118, 198425478, 731661754, 2758808581, 10629386376, 41814350148, 167830018952, 686822393793, 2864024856054, 12162059027416, 52564545391789
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Number of square binary matrices with n ones and with no zero rows or columns is A104602(n). - Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 25 2006
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LINKS
| Max Alekseyev, Table of n, a(n) for n = 1..30
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EXAMPLE
| There are 666 square binary matrices with 10 ones, with no zero rows or columns, up to row and column permutation: 33 of size 4 X 4, 248 of size 5 X 5, 288 of size 6 X 6, 79 of size 7 X 7, 15 of size 8 X 8, 2 of size 9 X 9 and 1 of size 10 X 10. Cf. A057150.
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CROSSREFS
| Cf. A056080, A056037, A056079, A057149, A057150, A057152, A049311.
Sequence in context: A019231 A112483 A151381 * A026699 A078678 A027056
Adjacent sequences: A057148 A057149 A057150 * A057152 A057153 A057154
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KEYWORD
| nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 14 2000
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EXTENSIONS
| More terms from Max Alekseyev (maxale(AT)gmail.com), May 31 2007
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