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.

A269021 Number of permutations of [2n] containing an increasing subsequence of length n.

Table of values

n a(n)
0 1
1 2
2 23
3 588
4 24553
5 1438112
6 108469917
7 9996042284
8 1086997811325
9 136102249609224
10 19269396089593156
11 3042212958893941456
12 529708789768374664407
13 100813134967124531098768
14 20816198414187782633783462
15 4634136282168760818748363080

List of values

[1, 2, 23, 588, 24553, 1438112, 108469917, 9996042284, 1086997811325, 136102249609224, 19269396089593156, 3042212958893941456, 529708789768374664407, 100813134967124531098768, 20816198414187782633783462, 4634136282168760818748363080]

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

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