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.

A317140 Number of permutations of [2n+1] with exactly n increasing runs of length two.

Table of values

n a(n)
0 1
1 4
2 43
3 906
4 31493
5 1629248
6 117248463
7 11190963430
8 1367267690953
9 208031951035452
10 38563334673062963
11 8554779137299629314
12 2237467931691025532493
13 681305299577272105281016
14 238929711424864185326131543
15 95603626135129502838914478558

List of values

[1, 4, 43, 906, 31493, 1629248, 117248463, 11190963430, 1367267690953, 208031951035452, 38563334673062963, 8554779137299629314, 2237467931691025532493, 681305299577272105281016, 238929711424864185326131543, 95603626135129502838914478558]

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

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