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.

A293088 Number of 2 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 two less than the number of 0's adjacent to some 1.

Table of values

n a(n)
1 0
2 0
3 5
4 23
5 124
6 518
7 2103
8 8304
9 32561
10 127188
11 497290
12 1944992
13 7609668
14 29781058
15 116601073
16 456769568
17 1790429581
18 7022484654
19 27560850105
20 108231066278
21 425262686638
22 1671850997415
23 6576007463557
24 25878627324698
25 101888312587090

List of values

[0, 0, 5, 23, 124, 518, 2103, 8304, 32561, 127188, 497290, 1944992, 7609668, 29781058, 116601073, 456769568, 1790429581, 7022484654, 27560850105, 108231066278, 425262686638, 1671850997415, 6576007463557, 25878627324698, 101888312587090]

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

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