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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.

A324352 Total number of occurrences of 2 in the (signed) displacement sets of all permutations of [n+2] divided by 2!.

Table of values

n a(n)
0 0
1 1
2 5
3 28
4 179
5 1306
6 10757
7 98932
8 1006007
9 11214406
10 136041329
11 1784556808
12 25174694723
13 380087428618
14 6115760751869
15 104481070398556
16 1888837397941487
17 36026457717419662
18 723015306101706857
19 15230427461356523056
20 336009169512596054459

List of values

[0, 1, 5, 28, 179, 1306, 10757, 98932, 1006007, 11214406, 136041329, 1784556808, 25174694723, 380087428618, 6115760751869, 104481070398556, 1888837397941487, 36026457717419662, 723015306101706857, 15230427461356523056, 336009169512596054459]

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

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