A129893 - cp's OEIS frontend

A129893 a(n) = s!/(s-n)! where s = (n*(n+1)/2)+1.

n	a(n)
0	1
1	2
2	12
3	210
4	7920
5	524160
6	53721360
7	7866331200
8	1556675366400
9	399790821830400
10	129210868410624000
11	51295616536721356800
12	24529502681864788608000
13	13903600298770901182464000

[1, 2, 12, 210, 7920, 524160, 53721360, 7866331200, 1556675366400, 399790821830400, 129210868410624000, 51295616536721356800, 24529502681864788608000, 13903600298770901182464000]

cp's OEIS Frontend

A129893 a(n) = s!/(s-n)! where s = (n*(n+1)/2)+1.

Table of values

List of values