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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.

A200800 Number of nX7 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

Table of values

n a(n)
1 715
2 9676364
3 122478253815
4 1557479347400065
5 19804473216531794553
6 251826890612151285556718
7 3202145671418507455058837791

List of values

[715, 9676364, 122478253815, 1557479347400065, 19804473216531794553, 251826890612151285556718, 3202145671418507455058837791]

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

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