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.

A368783 Lexicographic rank of the permutation which is the Eytzinger array layout of n elements.

Table of values

n a(n)
0 0
1 0
2 1
3 2
4 15
5 82
6 402
7 2352
8 22113
9 220504
10 2329650
11 26780256
12 293266680
13 3505934160
14 45390355920
15 633293015040
16 10873520709273
17 195823830637744
18 3698406245739330
19 73192513664010816
20 1509611621730135000
21 32576548307761013760
22 734272503865161846480

List of values

[0, 0, 1, 2, 15, 82, 402, 2352, 22113, 220504, 2329650, 26780256, 293266680, 3505934160, 45390355920, 633293015040, 10873520709273, 195823830637744, 3698406245739330, 73192513664010816, 1509611621730135000, 32576548307761013760, 734272503865161846480]

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

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