A123899 - cp's OEIS frontend

A123899 a(n) = (n+1)!/(d(n)*d(n+1)) where d(n) = cancellation factor in reducing Sum_{k=0...n} 1/k! to lowest terms.

n	a(n)
0	1
1	2
2	3
3	12
4	60
5	360
6	252
7	2016
8	36288
9	362880
10	4989600
11	11975040
12	622702080
13	8717829120
14	65383718400
15	5230697472000
16	2736057139200
17	49249028505600
18	30411275102208
19	608225502044160
20	25545471085854720000

[1, 2, 3, 12, 60, 360, 252, 2016, 36288, 362880, 4989600, 11975040, 622702080, 8717829120, 65383718400, 5230697472000, 2736057139200, 49249028505600, 30411275102208, 608225502044160, 25545471085854720000]

cp's OEIS Frontend

A123899 a(n) = (n+1)!/(d(n)*d(n+1)) where d(n) = cancellation factor in reducing Sum_{k=0...n} 1/k! to lowest terms.

Table of values

List of values