cp's OEIS Frontend

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.

A197275 Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,1,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 4
2 14
3 34
4 92
5 317
6 888
7 2626
8 8078
9 24103
10 72107
11 217970
12 656610
13 1975147
14 5955136
15 17950843
16 54086244
17 163025795
18 491430743
19 1481229421
20 4464844849
21 13458804609
22 40569450638
23 122290929298
24 368632726282
25 1111201586358
26 3349591968789

List of values

[4, 14, 34, 92, 317, 888, 2626, 8078, 24103, 72107, 217970, 656610, 1975147, 5955136, 17950843, 54086244, 163025795, 491430743, 1481229421, 4464844849, 13458804609, 40569450638, 122290929298, 368632726282, 1111201586358, 3349591968789]

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

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