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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.

A200798 Number of nX5 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 51
2 40148
3 34679839
4 30147154218
5 26207146328784
6 22781978610167987
7 19804473216531794553
8 17216114684815070366422
9 14966043352402318383229010
10 13010046560219625329665338289
11 11309690043874236949034566968117

List of values

[51, 40148, 34679839, 30147154218, 26207146328784, 22781978610167987, 19804473216531794553, 17216114684815070366422, 14966043352402318383229010, 13010046560219625329665338289, 11309690043874236949034566968117]

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

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