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.

A269269 Number of n X n 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.

Table of values

n a(n)
1 0
2 108
3 46872
4 74853576
5 542973139128
6 19356924219624936
7 3516906597130333936872
8 3322606082327701612506093240
9 16524782213263820847479975782463640

List of values

[0, 108, 46872, 74853576, 542973139128, 19356924219624936, 3516906597130333936872, 3322606082327701612506093240, 16524782213263820847479975782463640]

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

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