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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.

A199826 Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero.

Table of values

n a(n)
1 10
2 40
3 114
4 426
5 1650
6 6126
7 23206
8 88636
9 337866
10 1295566
11 4992364
12 19269156
13 74529210
14 288954786
15 1122363984
16 4366362420
17 17011617426
18 66365823648
19 259213619826
20 1013542247970
21 3966939195402
22 15540399135516
23 60929935280508

List of values

[10, 40, 114, 426, 1650, 6126, 23206, 88636, 337866, 1295566, 4992364, 19269156, 74529210, 288954786, 1122363984, 4366362420, 17011617426, 66365823648, 259213619826, 1013542247970, 3966939195402, 15540399135516, 60929935280508]

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

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