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.

A222450 Number of nX2 0..1 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
1 0
2 0
3 2
4 7
5 10
6 23
7 64
8 175
9 400
10 983
11 2498
12 6409
13 15982
14 40282
15 102240
16 260590
17 662008
18 1685764
19 4301724
20 10996863
21 28122246
22 71995471
23 184507156
24 473312401
25 1215008846
26 3121272497
27 8023924572
28 20640895689
29 53127720534
30 136821537884

List of values

[0, 0, 2, 7, 10, 23, 64, 175, 400, 983, 2498, 6409, 15982, 40282, 102240, 260590, 662008, 1685764, 4301724, 10996863, 28122246, 71995471, 184507156, 473312401, 1215008846, 3121272497, 8023924572, 20640895689, 53127720534, 136821537884]

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

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