cp's OEIS Frontend

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.

A269283 Number of n X n 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once.

Table of values

n a(n)
1 4
2 216
3 62748
4 87559668
5 598478857956
6 20680187784811380
7 3689070798270477232620
8 3444847181845510308844394628
9 16998439594375033474993893597991428

List of values

[4, 216, 62748, 87559668, 598478857956, 20680187784811380, 3689070798270477232620, 3444847181845510308844394628, 16998439594375033474993893597991428]

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

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