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A139009
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Number of n X n symmetric binary matrices containing no more than one 1 in any 3 X 3 sub-block.
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1
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1, 2, 3, 4, 10, 29, 73, 255, 1166, 5371, 29682, 210876, 1671283, 15280803, 171861787, 2259744342, 34374508575, 625277335018, 13461221324518, 338565697760175, 10066909617112085, 354314901636357736, 14658961195961880848
(list; graph; refs; listen; history; internal format)
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