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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.

A360426 Number of permutations of [2n] having exactly n alternating up/down runs where the first run is not a down run.

Table of values

n a(n)
0 1
1 1
2 6
3 118
4 4788
5 325446
6 33264396
7 4766383420
8 911323052520
9 224136553339270
10 68929638550210620
11 25914939202996628148
12 11693626371194331008088
13 6236691723226152102621084
14 3881046492003600271067466744
15 2786922888404654795314066258488
16 2287283298159853722760705106305488

List of values

[1, 1, 6, 118, 4788, 325446, 33264396, 4766383420, 911323052520, 224136553339270, 68929638550210620, 25914939202996628148, 11693626371194331008088, 6236691723226152102621084, 3881046492003600271067466744, 2786922888404654795314066258488, 2287283298159853722760705106305488]

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

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