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.

A279292 Number of permutations of [n] having exactly three (possibly overlapping) doubledescents.

Table of values

n a(n)
5 1
6 10
7 167
8 2064
9 28143
10 374166
11 5227491
12 75105984
13 1127851278
14 17625022976
15 287569327286
16 4891520843344
17 86749331150517
18 1602239541108282
19 30795187124606301
20 615261376037422992
21 12764913390565572333
22 274721686459213597782
23 6126847681304067647287

List of values

[1, 10, 167, 2064, 28143, 374166, 5227491, 75105984, 1127851278, 17625022976, 287569327286, 4891520843344, 86749331150517, 1602239541108282, 30795187124606301, 615261376037422992, 12764913390565572333, 274721686459213597782, 6126847681304067647287]

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

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