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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.

A197884 Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,1,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 3
3 6
4 47
5 77
6 196
7 529
8 1637
9 4235
10 11211
11 30271
12 83254
13 225148
14 606579
15 1638498
16 4440639
17 12016918
18 32485381
19 87846790
20 237662631
21 642926239
22 1738933011
23 4703362637
24 12722244082
25 34413103568
26 93083202626
27 251777401480

List of values

[1, 3, 6, 47, 77, 196, 529, 1637, 4235, 11211, 30271, 83254, 225148, 606579, 1638498, 4440639, 12016918, 32485381, 87846790, 237662631, 642926239, 1738933011, 4703362637, 12722244082, 34413103568, 93083202626, 251777401480]

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

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