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.

A290954 The number of permutations in S_n for which the number of reduced words is minimized with respect to the numbers of braid and commutation classes: |R(w)| = |B(w)| + |C(w)| - 1.

Table of values

n a(n)
1 1
2 2
3 6
4 23
5 65
6 177
7 506
8 1551
9 5041
10 17049
11 59131
12 208469
13 743491
14 2675189
15 9695778
16 35358815
17 129646177
18 477640361
19 1767265159
20 6564122733
21 24466269715
22 91482566757
23 343059617231
24 1289904151413
25 4861946406095
26 18367353077397
27 69533550921901
28 263747951756961
29 1002242216658727
30 3814986502100477

List of values

[1, 2, 6, 23, 65, 177, 506, 1551, 5041, 17049, 59131, 208469, 743491, 2675189, 9695778, 35358815, 129646177, 477640361, 1767265159, 6564122733, 24466269715, 91482566757, 343059617231, 1289904151413, 4861946406095, 18367353077397, 69533550921901, 263747951756961, 1002242216658727, 3814986502100477]

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

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