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.

A331347 Number of permutations w in S_n that form Boolean intervals [s, w] in the Bruhat order for every simple reflection s in the support of w.

Table of values

n a(n)
1 1
2 2
3 6
4 15
5 37
6 93
7 238
8 616
9 1604
10 4189
11 10955
12 28667
13 75036
14 196430
15 514242
16 1346283
17 3524593
18 9227481
19 24157834
20 63246004
21 165580160
22 433494457
23 1134903191
24 2971215095
25 7778742072
26 20365011098
27 53316291198
28 139583862471
29 365435296189
30 956722026069

List of values

[1, 2, 6, 15, 37, 93, 238, 616, 1604, 4189, 10955, 28667, 75036, 196430, 514242, 1346283, 3524593, 9227481, 24157834, 63246004, 165580160, 433494457, 1134903191, 2971215095, 7778742072, 20365011098, 53316291198, 139583862471, 365435296189, 956722026069]

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

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