A018927 - cp's OEIS frontend

A018927 For each permutation p of {1,2,...,n} define maxjump(p) = max(p(i) - i); a(n) is sum of maxjumps of all p.

n	a(n)
1	0
2	1
3	7
4	45
5	313
6	2421
7	20833
8	198309
9	2073793
10	23664021
11	292834513
12	3907994949
13	55967406433
14	856355084661
15	13944569166193
16	240803714700069
17	4395998055854593
18	84596337986326101
19	1711691067680320273
20	36329581765125539589
21	807099012174816776353

[0, 1, 7, 45, 313, 2421, 20833, 198309, 2073793, 23664021, 292834513, 3907994949, 55967406433, 856355084661, 13944569166193, 240803714700069, 4395998055854593, 84596337986326101, 1711691067680320273, 36329581765125539589, 807099012174816776353]

cp's OEIS Frontend

A018927 For each permutation p of {1,2,...,n} define maxjump(p) = max(p(i) - i); a(n) is sum of maxjumps of all p.

Table of values

List of values