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.

A102417 In the lexicographically ordered table of permutations of [n], there are two entries that give the greatest sum of pairwise products and they are reversals of each other. The items in this sequence are the indices of the earlier of the two.

Table of values

n a(n)
2 0
3 1
4 3
5 11
6 41
7 191
8 1055
9 6959
10 53159
11 462239
12 4499999
13 48454559
14 571409999
15 7321386239
16 101249648639
17 1502852279039
18 23827244757119
19 401839065331199
20 7182224591270400
21 135607710526041600
22 2696935204633823744

List of values

[0, 1, 3, 11, 41, 191, 1055, 6959, 53159, 462239, 4499999, 48454559, 571409999, 7321386239, 101249648639, 1502852279039, 23827244757119, 401839065331199, 7182224591270400, 135607710526041600, 2696935204633823744]

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

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