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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.

A208199 Number of nX6 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)
1 187
2 648569
3 2468504665
4 9402035642924
5 35810971705853725
6 136398703432330477549
7 519522527116810577984260
8 1978784616446414312287693835
9 7536898505819261464135073030914

List of values

[187, 648569, 2468504665, 9402035642924, 35810971705853725, 136398703432330477549, 519522527116810577984260, 1978784616446414312287693835, 7536898505819261464135073030914]

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

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