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.

A207819 Number of permutations of [n] with a fixed point and/or a succession.

Table of values

n a(n)
0 0
1 1
2 1
3 6
4 20
5 106
6 618
7 4358
8 34836
9 313592
10 3135988
11 34498646
12 414007634
13 5382362086
14 75356174332
15 1130382058576
16 18086649408624
17 307480839465174
18 5534775895914982
19 105162728081809146
20 2103289132221173216
21 44169707042511725964
22 971745847021319655464
23 22350404337704558809666
24 536415027665581568375190
25 13410494347081333360291850

List of values

[0, 1, 1, 6, 20, 106, 618, 4358, 34836, 313592, 3135988, 34498646, 414007634, 5382362086, 75356174332, 1130382058576, 18086649408624, 307480839465174, 5534775895914982, 105162728081809146, 2103289132221173216, 44169707042511725964, 971745847021319655464, 22350404337704558809666, 536415027665581568375190, 13410494347081333360291850]

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

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