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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.

A208197 Number of nX4 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors.

Table of values

n a(n)
1 15
2 2653
3 639701
4 156617480
5 38372808893
6 9402035642924
7 2303673397508915
8 564442821781056268
9 138298988287411669755
10 33885824084409470445384
11 8302657077306720410135797
12 2034305388933816797435987804

List of values

[15, 2653, 639701, 156617480, 38372808893, 9402035642924, 2303673397508915, 564442821781056268, 138298988287411669755, 33885824084409470445384, 8302657077306720410135797, 2034305388933816797435987804]

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

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