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.

A284107 Number of n X 2 0..1 arrays with the number of 1's king-move adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

Table of values

n a(n)
1 2
2 4
3 13
4 46
5 160
6 571
7 2095
8 7802
9 29326
10 111040
11 422862
12 1617611
13 6210935
14 23922207
15 92387315
16 357629430
17 1387192894
18 5390374430
19 20979391112
20 81768490420
21 319107181678
22 1246785919174
23 4876478734046
24 19091509694075

List of values

[2, 4, 13, 46, 160, 571, 2095, 7802, 29326, 111040, 422862, 1617611, 6210935, 23922207, 92387315, 357629430, 1387192894, 5390374430, 20979391112, 81768490420, 319107181678, 1246785919174, 4876478734046, 19091509694075]

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

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