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.

A284765 Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 one less than the number of 0's adjacent to some 1.

Table of values

n a(n)
1 0
2 4
3 14
4 52
5 206
6 772
7 2896
8 10996
9 41862
10 159836
11 612572
12 2354880
13 9076852
14 35073264
15 135823868
16 527012084
17 2048410070
18 7974173484
19 31085538148
20 121332433984
21 474123211448
22 1854631573500
23 7261693567782
24 28457603057044

List of values

[0, 4, 14, 52, 206, 772, 2896, 10996, 41862, 159836, 612572, 2354880, 9076852, 35073264, 135823868, 527012084, 2048410070, 7974173484, 31085538148, 121332433984, 474123211448, 1854631573500, 7261693567782, 28457603057044]

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

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