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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.

A369327 a(n) is the number of words of length n over the alphabet [n] and sortable by a (2,1)-pop stack of depth 2.

Table of values

n a(n)
0 1
1 1
2 4
3 24
4 149
5 923
6 5784
7 36708
8 235156
9 1516864
10 9838018
11 64093998
12 419137378
13 2749637566
14 18087479624
15 119263349200
16 788015054253
17 5216212564723
18 34584497597602
19 229635524379026
20 1526740206967913
21 10162620233598959
22 67719554546286284
23 451699650863065424

List of values

[1, 1, 4, 24, 149, 923, 5784, 36708, 235156, 1516864, 9838018, 64093998, 419137378, 2749637566, 18087479624, 119263349200, 788015054253, 5216212564723, 34584497597602, 229635524379026, 1526740206967913, 10162620233598959, 67719554546286284, 451699650863065424]

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

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