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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.

A301897 Number of permutations b of length n that satisfy the Diaconis-Graham inequality I_n(b) + EX_n(b) <= D_n(b) with equality.

Table of values

n a(n)
1 1
2 2
3 6
4 23
5 103
6 511
7 2719
8 15205
9 88197
10 526018
11 3206206
12 19885911
13 125107063
14 796453594
15 5121305414
16 33213428285
17 216998830397
18 1426936199824
19 9436710005524
20 62723077297135
21 418784925848463
22 2807458708620337
23 18889686239933521
24 127520180043751313
25 863473397167656913
26 5863055250124397156

List of values

[1, 2, 6, 23, 103, 511, 2719, 15205, 88197, 526018, 3206206, 19885911, 125107063, 796453594, 5121305414, 33213428285, 216998830397, 1426936199824, 9436710005524, 62723077297135, 418784925848463, 2807458708620337, 18889686239933521, 127520180043751313, 863473397167656913, 5863055250124397156]

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

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