A348311 - cp's OEIS frontend

A348311 a(n) = n! * Sum_{k=1..n} (-1)^k * (k-2) / (k-1)!.

n	a(n)
0	0
1	1
2	2
3	3
4	20
5	85
6	534
7	3703
8	29672
9	266985
10	2669930
11	29369131
12	352429692
13	4581585853
14	64142202110
15	962133031455
16	15394128503504
17	261700184559313
18	4710603322067922
19	89501463119290195
20	1790029262385804260
21	37590614510101889061
22	826993519222241559782

[0, 1, 2, 3, 20, 85, 534, 3703, 29672, 266985, 2669930, 29369131, 352429692, 4581585853, 64142202110, 962133031455, 15394128503504, 261700184559313, 4710603322067922, 89501463119290195, 1790029262385804260, 37590614510101889061, 826993519222241559782]

cp's OEIS Frontend

A348311 a(n) = n! * Sum_{k=1..n} (-1)^k * (k-2) / (k-1)!.

Table of values

List of values