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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.

A203968 Number of n X n 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by 0 1 to the left or above.

Original entry on oeis.org

1, 7, 258, 34799, 22100882, 64449537503, 847220834970347, 50681890300309193984, 13775254400039658772386790, 17006093281906665293267116254138
Offset: 1

Views

Author

R. H. Hardin Jan 08 2012

Keywords

Comments

Diagonal of A203975

Examples

			Some solutions for n=4
..0..0..0..0....0..0..1..0....0..0..0..0....0..0..1..0....0..0..1..2
..1..1..0..1....1..1..0..0....0..1..1..1....1..1..0..0....0..0..0..0
..0..0..0..1....0..0..1..2....1..2..0..0....0..1..0..0....0..1..0..1
..1..0..1..0....0..0..0..0....2..0..1..2....0..1..2..1....0..0..0..1

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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