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.

A151578 Number of permutations of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order.

Table of values

n a(n)
5 0
6 6
7 399
8 9528
9 140571
10 1561900
11 14413894
12 116857368
13 862140162
14 5925941490
15 38576132625
16 240659672336
17 1451515055333
18 8520359419080
19 48925419854400
20 275923203690000
21 1533178869210324
22 8414851432723230
23 45712442315346915
24 246193095207323400
25 1316311515774609375

List of values

[0, 6, 399, 9528, 140571, 1561900, 14413894, 116857368, 862140162, 5925941490, 38576132625, 240659672336, 1451515055333, 8520359419080, 48925419854400, 275923203690000, 1533178869210324, 8414851432723230, 45712442315346915, 246193095207323400, 1316311515774609375]

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

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