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.

A086854 Number of permutations of length n with exactly 3 rising or falling successions.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 2
5 16
6 120
7 888
8 7198
9 64968
10 650644
11 7165200
12 86059242
13 1119549472
14 15682257872
15 235336043976
16 3766695159030
17 64052134910168
18 1153211148654348
19 21915344800505888
20 438380075974889154
21 9207290871553008240
22 202585136417883766472
23 4659950328485470292632

List of values

[0, 0, 0, 0, 2, 16, 120, 888, 7198, 64968, 650644, 7165200, 86059242, 1119549472, 15682257872, 235336043976, 3766695159030, 64052134910168, 1153211148654348, 21915344800505888, 438380075974889154, 9207290871553008240, 202585136417883766472, 4659950328485470292632]

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

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