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.

A219143 Unchanging value maps: number of 2 X n binary arrays indicating the locations of corresponding elements unequal to no horizontal, diagonal or antidiagonal neighbor in a random 0..2 2 X n array.

Table of values

n a(n)
1 1
2 6
3 18
4 39
5 96
6 225
7 543
8 1293
9 3096
10 7392
11 17673
12 42228
13 100929
14 241197
15 576441
16 1377606
17 3292314
18 7868187
19 18803964
20 44939013
21 107398431
22 256668285
23 613403916
24 1465955712
25 3503443917
26 8372776200
27 20009848437
28 47820940581
29 114285841233

List of values

[1, 6, 18, 39, 96, 225, 543, 1293, 3096, 7392, 17673, 42228, 100929, 241197, 576441, 1377606, 3292314, 7868187, 18803964, 44939013, 107398431, 256668285, 613403916, 1465955712, 3503443917, 8372776200, 20009848437, 47820940581, 114285841233]

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

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