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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.

A209326 Number of permutations of [n] with a fixed point but no succession.

Table of values

n a(n)
0 0
1 1
2 0
3 3
4 7
5 39
6 207
7 1437
8 11203
9 99041
10 975645
11 10601377
12 125905445
13 1622349059
14 22539777113
15 335845307359
16 5341990288103
17 90340567900583
18 1618553943500599
19 30623660893656205
20 610152486797080443
21 12769086757046132625
22 280037186109883699885
23 6422309829486480886809
24 153727262708736577446741
25 3833789797689152809143363

List of values

[0, 1, 0, 3, 7, 39, 207, 1437, 11203, 99041, 975645, 10601377, 125905445, 1622349059, 22539777113, 335845307359, 5341990288103, 90340567900583, 1618553943500599, 30623660893656205, 610152486797080443, 12769086757046132625, 280037186109883699885, 6422309829486480886809, 153727262708736577446741, 3833789797689152809143363]

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

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