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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.

A375303 a(n) is the rank of row n of A130517 in a lexicographic permutation of [1, ..., n].

Table of values

n a(n)
1 0
2 1
3 4
4 20
5 108
6 678
7 4848
8 39264
9 355920
10 3575640
11 39454560
12 474501600
13 6178566240
14 86606881200
15 1300352981760
16 20821540239360
17 354184575816960
18 6378546460970880
19 121243261343500800
20 2425719783585369600
21 50955334461183398400
22 1121303792572973856000
23 25795667534014525593600

List of values

[0, 1, 4, 20, 108, 678, 4848, 39264, 355920, 3575640, 39454560, 474501600, 6178566240, 86606881200, 1300352981760, 20821540239360, 354184575816960, 6378546460970880, 121243261343500800, 2425719783585369600, 50955334461183398400, 1121303792572973856000, 25795667534014525593600]

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

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