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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.

A225989 Number of pairs of orthogonal (-1,3) vectors of length 4*n.

Table of values

n a(n)
1 20
2 3192
3 652784
4 134432480
5 28244153600
6 6052498776192
7 1314942362273280
8 288501497813552640
9 63776322167821168640
10 14182989297327325110272
11 3169467786802943379238912
12 711136363409644515952173056

List of values

[20, 3192, 652784, 134432480, 28244153600, 6052498776192, 1314942362273280, 288501497813552640, 63776322167821168640, 14182989297327325110272, 3169467786802943379238912, 711136363409644515952173056]

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

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