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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.

A196013 Number of n X 4 0..4 arrays with each element equal to the number its horizontal and vertical neighbors within one of itself.

Table of values

n a(n)
1 1
2 1
3 7
4 25
5 27
6 91
7 231
8 455
9 1135
10 2693
11 6041
12 14257
13 33349
14 76941
15 179553
16 418345
17 971503
18 2261807
19 5264419
20 12243481
21 28490729
22 66295633
23 154236017
24 358872825
25 835013523
26 1942797397
27 4520363539
28 10517663443
29 24471508585
30 56938341019

List of values

[1, 1, 7, 25, 27, 91, 231, 455, 1135, 2693, 6041, 14257, 33349, 76941, 179553, 418345, 971503, 2261807, 5264419, 12243481, 28490729, 66295633, 154236017, 358872825, 835013523, 1942797397, 4520363539, 10517663443, 24471508585, 56938341019]

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

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