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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.

A288208 Number of permutations of a sequence of length n such that there are no fixed points, and no term is next to a term it was next to originally.

Table of values

n a(n)
0 1
1 0
2 0
3 0
4 2
5 2
6 27
7 214
8 1695
9 15482
10 159019
11 1775664
12 21542628
13 282722448
14 3989526469
15 60239477384
16 969280731152
17 16558273230450
18 299319139977198
19 5708394302035014
20 114547714715532531
21 2412649672553637772
22 53220018152831892175
23 1227013593901474460674
24 29512839964990444892407

List of values

[1, 0, 0, 0, 2, 2, 27, 214, 1695, 15482, 159019, 1775664, 21542628, 282722448, 3989526469, 60239477384, 969280731152, 16558273230450, 299319139977198, 5708394302035014, 114547714715532531, 2412649672553637772, 53220018152831892175, 1227013593901474460674, 29512839964990444892407]

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

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