A198892 - cp's OEIS frontend

A198892 E.g.f.: 1/[ Sum_{n>=0} (-x)^(n*(n+1)/2) / A000178(n) ] where A000178(n) = Product_{k=1..n} k!.

n	a(n)
0	1
1	1
2	2
3	9
4	48
5	300
6	2280
7	20580
8	211680
9	2434320
10	31134600
11	438807600
12	6744276000
13	112237725600
14	2011760150400
15	38639999197800
16	791610365145600
17	17230493212732800
18	397111119429024000
19	9660782144094681600
20	247393077222459168000
21	6651976858409613931200

[1, 1, 2, 9, 48, 300, 2280, 20580, 211680, 2434320, 31134600, 438807600, 6744276000, 112237725600, 2011760150400, 38639999197800, 791610365145600, 17230493212732800, 397111119429024000, 9660782144094681600, 247393077222459168000, 6651976858409613931200]

cp's OEIS Frontend

A198892 E.g.f.: 1/[ Sum_{n>=0} (-x)^(n*(n+1)/2) / A000178(n) ] where A000178(n) = Product_{k=1..n} k!.

Table of values

List of values