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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.

A222763 Number of n X 2 0..1 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
0 1
1 0
2 3
3 4
4 20
5 48
6 175
7 512
8 1719
9 5400
10 17776
11 57420
12 188656
13 617176
14 2033175
15 6697744
16 22139780
17 73262232
18 242931321
19 806516560
20 2681475048
21 8925158440
22 29740390672
23 99196158144
24 331163178475
25 1106489052968
26 3699881730900
27 12380449027324
28 41454579098852

List of values

[1, 0, 3, 4, 20, 48, 175, 512, 1719, 5400, 17776, 57420, 188656, 617176, 2033175, 6697744, 22139780, 73262232, 242931321, 806516560, 2681475048, 8925158440, 29740390672, 99196158144, 331163178475, 1106489052968, 3699881730900, 12380449027324, 41454579098852]

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

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