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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.

A279297 Number of permutations of [n] having exactly eight (possibly overlapping) doubledescents.

Table of values

n a(n)
10 1
11 20
12 4280
13 127917
14 6402984
15 208910728
16 7440888001
17 237920318012
18 7682498246390
19 241437687882797
20 7610900307811180
21 239466123419848086
22 7589962647890648579
23 242520044163828141976
24 7839783867491553405462
25 256717246780820798056943
26 8529320594216231644881865

List of values

[1, 20, 4280, 127917, 6402984, 208910728, 7440888001, 237920318012, 7682498246390, 241437687882797, 7610900307811180, 239466123419848086, 7589962647890648579, 242520044163828141976, 7839783867491553405462, 256717246780820798056943, 8529320594216231644881865]

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

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