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.

A222504 Number of nX3 0..1 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
1 0
2 4
3 4
4 35
5 87
6 496
7 1335
8 7552
9 21382
10 122942
11 348597
12 2045395
13 5812073
14 34558802
15 98272393
16 589386556
17 1678849694
18 10123122248
19 28893573238
20 174842616458
21 500084523708
22 3033764103592
23 8694157659203
24 52844583851218
25 151707321284408

List of values

[0, 4, 4, 35, 87, 496, 1335, 7552, 21382, 122942, 348597, 2045395, 5812073, 34558802, 98272393, 589386556, 1678849694, 10123122248, 28893573238, 174842616458, 500084523708, 3033764103592, 8694157659203, 52844583851218, 151707321284408]

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

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