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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.

A196952 Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,3,4,0 for x=0,1,2,3,4.

Table of values

n a(n)
1 3
2 9
3 26
4 87
5 282
6 919
7 2987
8 9722
9 31643
10 102962
11 335048
12 1090310
13 3548040
14 11545789
15 37571671
16 122263766
17 397863990
18 1294706917
19 4213164246
20 13710247872
21 44615134395
22 145184117131
23 472450174347
24 1537421386475
25 5002992156783

List of values

[3, 9, 26, 87, 282, 919, 2987, 9722, 31643, 102962, 335048, 1090310, 3548040, 11545789, 37571671, 122263766, 397863990, 1294706917, 4213164246, 13710247872, 44615134395, 145184117131, 472450174347, 1537421386475, 5002992156783]

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

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