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.

A196953 Number of nX4 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 4
2 20
3 87
4 492
5 2687
6 14509
7 78717
8 427700
9 2320738
10 12593583
11 68356288
12 370995901
13 2013496775
14 10928042781
15 59310677884
16 321900611044
17 1747074166413
18 9482023129916
19 51462457739671
20 279305865035645
21 1515896714830837

List of values

[4, 20, 87, 492, 2687, 14509, 78717, 427700, 2320738, 12593583, 68356288, 370995901, 2013496775, 10928042781, 59310677884, 321900611044, 1747074166413, 9482023129916, 51462457739671, 279305865035645, 1515896714830837]

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

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