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A135589
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Triangle T(n,k) read by rows: number of k X k symmetric (0,1)-matrices with exactly n entries equal to 1 and no zero rows or columns.
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3
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1, 0, 1, 0, 0, 2, 0, 0, 2, 4, 0, 0, 1, 9, 10, 0, 0, 0, 12, 36, 26, 0, 0, 0, 10, 76, 140, 76, 0, 0, 0, 6, 116, 420, 540, 232, 0, 0, 0, 3, 138, 915, 2160, 2142, 764, 0, 0, 0, 1, 136, 1605, 6230, 10766, 8624, 2620, 0, 0, 0, 0, 116, 2372, 14436, 39130, 53312, 35856, 9496, 0, 0, 0, 0
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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EXAMPLE
| 1
0,1
0,0,2
0,0,2,4
0,0,1,9,10
0,0,0,12,36,26
0,0,0,10,76,140,76
0,0,0,6,116,420,540,232
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CROSSREFS
| Sequence in context: A134312 A195581 A020474 * A158122 A028641 A141416
Adjacent sequences: A135586 A135587 A135588 * A135590 A135591 A135592
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KEYWORD
| nonn,tabl
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 25 2008
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