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.

A159139 Number of permutations of 1..n containing the relative rank sequence { 213465 } at any spacing.

Table of values

n a(n)
6 1
7 37
8 891
9 18043
10 337210
11 6081686
12 108469917
13 1941309261
14 35187952132
15 649951312000
16 12286366975723
17 238445927000811
18 4762398793018878
19 98074791689121162
20 2085684931155975120
21 45859509146309390064
22 1043533983233372354613
23 24590543663448304800169

List of values

[1, 37, 891, 18043, 337210, 6081686, 108469917, 1941309261, 35187952132, 649951312000, 12286366975723, 238445927000811, 4762398793018878, 98074791689121162, 2085684931155975120, 45859509146309390064, 1043533983233372354613, 24590543663448304800169]

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

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