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.

A289646 Number of n X 3 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically 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 11
3 61
4 607
5 3160
6 31271
7 183390
8 1714758
9 10957160
10 97430209
11 660963859
12 5659723958
13 40059954256
14 334030499016
15 2436982696260
16 19950172380212
17 148739597215073
18 1202453728957318
19 9105730676248720
20 72992556634640541

List of values

[0, 11, 61, 607, 3160, 31271, 183390, 1714758, 10957160, 97430209, 660963859, 5659723958, 40059954256, 334030499016, 2436982696260, 19950172380212, 148739597215073, 1202453728957318, 9105730676248720, 72992556634640541]

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

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