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.

A095889 Number of permutations of [n] with exactly 3 descents which avoid the pattern 4321.

Table of values

n a(n)
5 10
6 148
7 1260
8 8160
9 44790
10 220180
11 1001000
12 4295168
13 17633122
14 69921460
15 269652100
16 1016524352
17 3760334958
18 13690636212
19 49172875520
20 174559419680
21 613383654170
22 2136135472020
23 7380351046300
24 25319087913760
25 86308819112550
26 292526411823828
27 986294675689560

List of values

[10, 148, 1260, 8160, 44790, 220180, 1001000, 4295168, 17633122, 69921460, 269652100, 1016524352, 3760334958, 13690636212, 49172875520, 174559419680, 613383654170, 2136135472020, 7380351046300, 25319087913760, 86308819112550, 292526411823828, 986294675689560]

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

Content is available under The OEIS End-User License Agreement.