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.

A279293 Number of permutations of [n] having exactly four (possibly overlapping) doubledescents.

Table of values

n a(n)
6 1
7 12
8 316
9 4961
10 88482
11 1456780
12 24970807
13 430069638
14 7646066285
15 139512608803
16 2630205520242
17 51191324887317
18 1030225266241718
19 21431850533761458
20 460916811387051427
21 10243049068068285706
22 235127217600172319772
23 5571780677576178939683

List of values

[1, 12, 316, 4961, 88482, 1456780, 24970807, 430069638, 7646066285, 139512608803, 2630205520242, 51191324887317, 1030225266241718, 21431850533761458, 460916811387051427, 10243049068068285706, 235127217600172319772, 5571780677576178939683]

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

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