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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.

A201956 Number of zero-sum nX3 -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors.

Table of values

n a(n)
1 37
2 1587
3 17091
4 303955
5 4735345
6 85454789
7 1489376611
8 27222524599
9 493561989579
10 9124430335331
11 168519041238653
12 3142665027511853
13 58661584782394781
14 1101133968614654601
15 20697996312691430763

List of values

[37, 1587, 17091, 303955, 4735345, 85454789, 1489376611, 27222524599, 493561989579, 9124430335331, 168519041238653, 3142665027511853, 58661584782394781, 1101133968614654601, 20697996312691430763]

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

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