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Search: id:A052371
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| A052371 |
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Triangle T(n,k) of n X n binary matrices with k=0...n^2 ones up to row and column permutations. |
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3
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| 1, 1, 1, 1, 3, 1, 1, 1, 1, 3, 6, 7, 7, 6, 3, 1, 1, 1, 1, 3, 6, 16, 21, 39, 44, 55, 44, 39, 21, 16, 6, 3, 1, 1, 1, 1, 3, 6, 16, 34, 69, 130, 234, 367, 527, 669, 755, 755, 669, 527, 367, 234, 130, 69, 34, 16, 6, 3, 1, 1
(list; graph; listen)
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OFFSET
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1,5
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EXAMPLE
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[1, 1], [1, 1, 3, 1, 1], [1, 1, 3, 6, 7, 7, 6, 3, 1, 1] (the last block giving the numbers of 3 X 3 binary matrices with k=0...9 ones up to row and column permutations).
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CROSSREFS
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Cf. A002724, A049311, A053304, A053305.
Sequence in context: A073780 A124389 A027023 this_sequence A062278 A016465 A122947
Adjacent sequences: A052368 A052369 A052370 this_sequence A052372 A052373 A052374
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KEYWORD
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nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Mar 08 2000
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