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.

A246247 Number of permutations of [n] with exactly two occurrences of the consecutive step pattern up, down, down.

Table of values

n a(n)
7 99
8 2214
9 38394
10 591543
11 8826246
12 131367258
13 1989555210
14 30951663300
15 497599843140
16 8291940960690
17 143459287215300
18 2578465192541220
19 48147387009459165
20 933704978071539690
21 18794023286090727870
22 392361396798154377681
23 8489006744706293477274

List of values

[99, 2214, 38394, 591543, 8826246, 131367258, 1989555210, 30951663300, 497599843140, 8291940960690, 143459287215300, 2578465192541220, 48147387009459165, 933704978071539690, 18794023286090727870, 392361396798154377681, 8489006744706293477274]

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

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