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.

A269280 Number of 5Xn 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 236196
3 36673560
4 4684312584
5 542973139128
6 59587625651904
7 6310088238337128
8 651615466055490216
9 66042694681962193944
10 6597498728751383594736
11 651529527626284234223688

List of values

[0, 236196, 36673560, 4684312584, 542973139128, 59587625651904, 6310088238337128, 651615466055490216, 66042694681962193944, 6597498728751383594736, 651529527626284234223688]

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

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