A140307 Number of n X n binary matrices containing at most four 1's in any 3 X 3 sub-block.
1, 2, 16, 256, 15982, 3082378, 1476568000, 2280441045555, 10599616558936358, 140380164790852384033
Offset: 0
Keywords
Crossrefs
Cf. A139810.
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