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.

A284224 Number of 3 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

Table of values

n a(n)
1 4
2 19
3 70
4 499
5 3214
6 22729
7 163708
8 1209005
9 9018250
10 67956917
11 515031078
12 3926103884
13 30049105764
14 230871573750
15 1779036977175
16 13746097605518
17 106448904000193
18 826010061981163
19 6420762665883318
20 49989175241774203

List of values

[4, 19, 70, 499, 3214, 22729, 163708, 1209005, 9018250, 67956917, 515031078, 3926103884, 30049105764, 230871573750, 1779036977175, 13746097605518, 106448904000193, 826010061981163, 6420762665883318, 49989175241774203]

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

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