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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.

A290953 The number of permutations in S_n for which the number of reduced words is maximized with respect to the numbers of braid and commutation classes: |R(w)| = |B(w)| * |C(w)|.

Table of values

n a(n)
1 1
2 2
3 6
4 16
5 45
6 136
7 434
8 1436
9 4869
10 16804
11 58795
12 208022
13 742911
14 2674452
15 9694858
16 35357684
17 129644805
18 477638716
19 1767263207
20 6564120438
21 24466267039
22 91482563660
23 343059613671
24 1289904147346
25 4861946401475
26 18367353072176
27 69533550916029
28 263747951750386
29 1002242216651395
30 3814986502092332

List of values

[1, 2, 6, 16, 45, 136, 434, 1436, 4869, 16804, 58795, 208022, 742911, 2674452, 9694858, 35357684, 129644805, 477638716, 1767263207, 6564120438, 24466267039, 91482563660, 343059613671, 1289904147346, 4861946401475, 18367353072176, 69533550916029, 263747951750386, 1002242216651395, 3814986502092332]

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

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