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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.

Table of values

n a(n)
1 1
2 7
3 258
4 34799
5 22100882
6 64449537503
7 847220834970347
8 50681890300309193984
9 13775254400039658772386790
10 17006093281906665293267116254138

List of values

[1, 7, 258, 34799, 22100882, 64449537503, 847220834970347, 50681890300309193984, 13775254400039658772386790, 17006093281906665293267116254138]

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

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