A217239 - cp's OEIS frontend

A217239 a(n) = n!(!n - 1) = n! Sum_{k=1..n-1} k!.

n	a(n)
0	0
1	0
2	2
3	18
4	216
5	3960
6	110160
7	4399920
8	238412160
9	16777031040
10	1484589254400
11	161180565638400
12	21054377854540800
13	3256459838542310400
14	588451470350449305600
15	122827588903536701184000
16	29325437466043778002944000

[0, 0, 2, 18, 216, 3960, 110160, 4399920, 238412160, 16777031040, 1484589254400, 161180565638400, 21054377854540800, 3256459838542310400, 588451470350449305600, 122827588903536701184000, 29325437466043778002944000]

cp's OEIS Frontend

A217239 a(n) = n!(!n - 1) = n! Sum_{k=1..n-1} k!.

Table of values

List of values

cp's OEIS Frontend

A217239 a(n) = n!*(!n - 1) = n! * Sum_{k=1..n-1} k!.

Table of values

List of values

A217239 a(n) = n!(!n - 1) = n! Sum_{k=1..n-1} k!.