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.

A196805 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,2,3,0,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 7
3 37
4 193
5 1515
6 8719
7 52291
8 334317
9 2067173
10 12663609
11 78727511
12 488078559
13 3014804713
14 18665197193
15 115593457951
16 715253390987
17 4426801402571
18 27403189146691
19 169608418907807
20 1049766166947791
21 6497692031157569

List of values

[1, 7, 37, 193, 1515, 8719, 52291, 334317, 2067173, 12663609, 78727511, 488078559, 3014804713, 18665197193, 115593457951, 715253390987, 4426801402571, 27403189146691, 169608418907807, 1049766166947791, 6497692031157569]

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

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