cp's OEIS Frontend

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.

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A207420 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.

Original entry on oeis.org

2, 16, 114, 1521, 55361, 3892729, 474552171, 116947584576, 59951676534906, 60921409199181129, 121441530119384020545, 483128923550195512221129, 3857404253001354057074186601, 61418617253685924322130029824769
Offset: 1

Views

Author

R. H. Hardin Feb 17 2012

Keywords

Comments

Diagonal of A207426

Examples

			Some solutions for n=4
..1..0..1..1....1..1..1..0....1..0..0..1....0..0..1..1....0..1..1..0
..0..0..1..1....0..0..1..1....1..0..1..1....1..1..1..0....1..0..1..1
..1..0..1..1....0..1..1..1....0..0..1..1....1..1..0..0....1..0..0..1
..1..0..0..1....0..1..1..1....1..0..0..1....1..1..1..0....0..0..1..1
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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