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.

A284336 Number of 3 X n 0..1 arrays with the number of 1's horizontally, diagonally 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 13
3 49
4 373
5 2259
6 18114
7 120058
8 959041
9 6725380
10 53524100
11 389145239
12 3078502323
13 22909373317
14 180462930528
15 1364622501692
16 10722180215723
17 81993405397067
18 643447267719348
19 4960055945696896
20 38910411283028492

List of values

[4, 13, 49, 373, 2259, 18114, 120058, 959041, 6725380, 53524100, 389145239, 3078502323, 22909373317, 180462930528, 1364622501692, 10722180215723, 81993405397067, 643447267719348, 4960055945696896, 38910411283028492]

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

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