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.

A369325 a(n) is the number of words of length n over the alphabet [n], avoiding 120 and 210, and sortable by a stack of depth 2.

Table of values

n a(n)
0 0
1 1
2 4
3 25
4 176
5 1281
6 9472
7 70785
8 533248
9 4042753
10 30808064
11 235778049
12 1810915328
13 13951401985
14 107765334016
15 834322202625
16 6472333459456
17 50299072937985
18 391513776848896
19 3051764505903105
20 23818327111499776
21 186112536460918785
22 1455790849571946496
23 11398349517712523265

List of values

[0, 1, 4, 25, 176, 1281, 9472, 70785, 533248, 4042753, 30808064, 235778049, 1810915328, 13951401985, 107765334016, 834322202625, 6472333459456, 50299072937985, 391513776848896, 3051764505903105, 23818327111499776, 186112536460918785, 1455790849571946496, 11398349517712523265]

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

Content is available under The OEIS End-User License Agreement.