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.

A321111 Number of permutations p of [n] such that in 0p the largest up-jump equals four and no down-jump is larger than 2.

Table of values

n a(n)
4 4
5 20
6 108
7 586
8 3098
9 16230
10 85150
11 446972
12 2349616
13 12376800
14 65353448
15 345933358
16 1835637246
17 9764363438
18 52064375292
19 278256581910
20 1490475179006
21 8000983513636
22 43039329754332
23 231982689315468
24 1252791611642654
25 6777998215153164
26 36735901427197962

List of values

[4, 20, 108, 586, 3098, 16230, 85150, 446972, 2349616, 12376800, 65353448, 345933358, 1835637246, 9764363438, 52064375292, 278256581910, 1490475179006, 8000983513636, 43039329754332, 231982689315468, 1252791611642654, 6777998215153164, 36735901427197962]

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

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