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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.

A196140 Number of nX2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,4,1,2 for x=0,1,2,3,4.

Table of values

n a(n)
1 3
2 5
3 8
4 17
5 34
6 62
7 123
8 243
9 471
10 924
11 1817
12 3558
13 6978
14 13697
15 26865
16 52699
17 103398
18 202847
19 397944
20 780720
21 1531657
22 3004865
23 5895113
24 11565346
25 22689467
26 44513380
27 87328672
28 171325871
29 336115955
30 659409701
31 1293664016
32 2537976953
33 4979134498

List of values

[3, 5, 8, 17, 34, 62, 123, 243, 471, 924, 1817, 3558, 6978, 13697, 26865, 52699, 103398, 202847, 397944, 780720, 1531657, 3004865, 5895113, 11565346, 22689467, 44513380, 87328672, 171325871, 336115955, 659409701, 1293664016, 2537976953, 4979134498]

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

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