A330493 - cp's OEIS frontend

A330493 a(n) = Sum_{k=1..n} (-1)^(n-k) * Stirling1(n,k) * (k-1)! * tau(k), where tau = A000005.

n	a(n)
1	1
2	3
3	12
4	70
5	492
6	4298
7	43894
8	514666
9	6830888
10	101473632
11	1664125944
12	29858266392
13	582481147440
14	12281821373040
15	278257595964576
16	6739505703156192
17	173785740554811264
18	4754455742416944000
19	137571331202872821504
20	4197696814883284962048

[1, 3, 12, 70, 492, 4298, 43894, 514666, 6830888, 101473632, 1664125944, 29858266392, 582481147440, 12281821373040, 278257595964576, 6739505703156192, 173785740554811264, 4754455742416944000, 137571331202872821504, 4197696814883284962048]

cp's OEIS Frontend

A330493 a(n) = Sum_{k=1..n} (-1)^(n-k) * Stirling1(n,k) * (k-1)! * tau(k), where tau = A000005.

Table of values

List of values