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.

A317282 Number of permutations of [n] with exactly two increasing runs of even length.

Table of values

n a(n)
4 5
5 43
6 258
7 1853
8 15634
9 133697
10 1207256
11 11974457
12 126980013
13 1421291622
14 16925790480
15 213992804118
16 2851968574855
17 39996895523591
18 589713707701692
19 9114791365659163
20 147335664946835342
21 2486973983349027871
22 43763134470537718258
23 801419373432471123541

List of values

[5, 43, 258, 1853, 15634, 133697, 1207256, 11974457, 126980013, 1421291622, 16925790480, 213992804118, 2851968574855, 39996895523591, 589713707701692, 9114791365659163, 147335664946835342, 2486973983349027871, 43763134470537718258, 801419373432471123541]

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

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