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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.

A196206 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 5
2 11
3 14
4 35
5 70
6 136
7 305
8 611
9 1321
10 2832
11 6041
12 12936
13 27706
14 59515
15 128053
16 275195
17 591576
18 1272021
19 2736374
20 5887462
21 12665855
22 27247361
23 58620223
24 126125420
25 271372681
26 583876552
27 1256241214
28 2702904009
29 5815589949

List of values

[5, 11, 14, 35, 70, 136, 305, 611, 1321, 2832, 6041, 12936, 27706, 59515, 128053, 275195, 591576, 1272021, 2736374, 5887462, 12665855, 27247361, 58620223, 126125420, 271372681, 583876552, 1256241214, 2702904009, 5815589949]

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

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