A357479 - cp's OEIS frontend

A357479 a(n) = (n!/6) * Sum_{k=0..n-3} 1/k!.

n	a(n)
0	0
1	0
2	0
3	1
4	8
5	50
6	320
7	2275
8	18256
9	164388
10	1644000
11	18084165
12	217010200
13	2821132886
14	39495860768
15	592437911975
16	9479006592160
17	161143112067400
18	2900576017214016
19	55110944327067273
20	1102218886541346600
21	23146596617368279930
22	509225125582102160000

[0, 0, 0, 1, 8, 50, 320, 2275, 18256, 164388, 1644000, 18084165, 217010200, 2821132886, 39495860768, 592437911975, 9479006592160, 161143112067400, 2900576017214016, 55110944327067273, 1102218886541346600, 23146596617368279930, 509225125582102160000]

cp's OEIS Frontend

A357479 a(n) = (n!/6) * Sum_{k=0..n-3} 1/k!.

Table of values

List of values