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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A140306 Number of n X n binary matrices containing at most three 1's in any 3 X 3 sub-block.

Original entry on oeis.org

1, 2, 15, 130, 4852, 456904, 73948482, 35616138799, 43142990277818, 115017363443317954, 771239506285440035857
Offset: 0

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Author

R. H. Hardin, May 27 2008

Keywords

Crossrefs

Cf. A139810.

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