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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.

A246248 Number of permutations of [n] with exactly three occurrences of the consecutive step pattern up, down, down.

Table of values

n a(n)
10 11259
11 443718
12 12450834
13 297195804
14 6589314360
15 141014406600
16 2982538767870
17 63210091744620
18 1354523537530620
19 29518995185712180
20 656767731733672680
21 14956075051814966040
22 349170616179434073825
23 8366057002343951876610
24 205839505389444095064510

List of values

[11259, 443718, 12450834, 297195804, 6589314360, 141014406600, 2982538767870, 63210091744620, 1354523537530620, 29518995185712180, 656767731733672680, 14956075051814966040, 349170616179434073825, 8366057002343951876610, 205839505389444095064510]

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

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