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.

A284217 Number of n X 3 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 3
2 13
3 70
4 467
5 3224
6 23218
7 170155
8 1264605
9 9488108
10 71718240
11 545264052
12 4165262662
13 31943452900
14 245786167555
15 1896529843618
16 14669730799547
17 113713016901442
18 883107039574428
19 6869733556332042
20 53519589494550372

List of values

[3, 13, 70, 467, 3224, 23218, 170155, 1264605, 9488108, 71718240, 545264052, 4165262662, 31943452900, 245786167555, 1896529843618, 14669730799547, 113713016901442, 883107039574428, 6869733556332042, 53519589494550372]

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

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