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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.

A174074 Number of circular permutations of length n without consecutive triples i,i+2,i+4.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 6
5 22
6 109
7 657
8 4625
9 37186
10 336336
11 3379058
12 37328103
13 449669577
14 5866178493
15 82387080624
16 1239364493118
17 19881771085788
18 338797668091565
19 6111688544942463
20 116354993433563797
21 2331395107113471188
22 49042688584011866880
23 1080639600739277669092
24 24891049832682424745839

List of values

[1, 1, 1, 2, 6, 22, 109, 657, 4625, 37186, 336336, 3379058, 37328103, 449669577, 5866178493, 82387080624, 1239364493118, 19881771085788, 338797668091565, 6111688544942463, 116354993433563797, 2331395107113471188, 49042688584011866880, 1080639600739277669092, 24891049832682424745839]

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

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