A347993 - cp's OEIS frontend

A347993 a(n) = n! * Sum_{k=1..n} (-1)^(k+1) * n^(n-k) / (n-k)!.

n	a(n)
1	1
2	2
3	15
4	136
5	1645
6	24336
7	426979
8	8658560
9	199234809
10	5128019200
11	145969492471
12	4552809182208
13	154404454932325
14	5656950010320896
15	222655633595044875
16	9369696305273798656
17	419790650812640438641
18	19950175280765680680960
19	1002394352017754098219999
20	53092232229227200348160000

[1, 2, 15, 136, 1645, 24336, 426979, 8658560, 199234809, 5128019200, 145969492471, 4552809182208, 154404454932325, 5656950010320896, 222655633595044875, 9369696305273798656, 419790650812640438641, 19950175280765680680960, 1002394352017754098219999, 53092232229227200348160000]

cp's OEIS Frontend

A347993 a(n) = n! * Sum_{k=1..n} (-1)^(k+1) * n^(n-k) / (n-k)!.

Table of values

List of values