A373284 - cp's OEIS frontend

A373284 Number of permutations of {1, 2, 3, ..., n} that result in a final value of 0 by repeatedly iterating the process of "subtracting if the next item is greater or equal, otherwise adding" until there's only one number left.

n	a(n)
1	0
2	0
3	1
4	1
5	3
6	10
7	52
8	459
9	1271
10	10094
11	63133
12	547565
13	4431517
14	42046100
15	400782747
16	8711476734

[0, 0, 1, 1, 3, 10, 52, 459, 1271, 10094, 63133, 547565, 4431517, 42046100, 400782747, 8711476734]