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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.

A197313 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,1,1,0,0 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 2
3 10
4 160
5 152
6 790
7 2724
8 6242
9 26422
10 91756
11 281296
12 990140
13 3437208
14 11190922
15 37836768
16 129296206
17 433975472
18 1455029298
19 4951850734
20 16696765546
21 56134653324
22 190052231444
23 641906625424
24 2162290128232
25 7306324921304

List of values

[1, 2, 10, 160, 152, 790, 2724, 6242, 26422, 91756, 281296, 990140, 3437208, 11190922, 37836768, 129296206, 433975472, 1455029298, 4951850734, 16696765546, 56134653324, 190052231444, 641906625424, 2162290128232, 7306324921304]

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

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