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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.

A200799 Number of n X 6 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)
1 187
2 622645
3 2060918000
4 6852264918471
5 22781978610167987
6 75743730886453371522
7 251826890612151285556718
8 837254535307721417534184492
9 2783639010978210077196779661724

List of values

[187, 622645, 2060918000, 6852264918471, 22781978610167987, 75743730886453371522, 251826890612151285556718, 837254535307721417534184492, 2783639010978210077196779661724]

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

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