A306665 - cp's OEIS frontend

A306665 Expansion of Sum_{k>=0} k! * x^(k*(k+1)/2) / Product_{j=1..k} (1 - x^j)^j.

n	a(n)
0	1
1	1
2	1
3	3
4	3
5	7
6	13
7	19
8	31
9	57
10	99
11	145
12	253
13	391
14	661
15	1071
16	1647
17	2617
18	4189
19	6439
20	10183
21	15999
22	24195
23	37537
24	57553
25	87925
26	132841
27	202899
28	306147
29	458827
30	688501
31	1030147
32	1533535
33	2280549
34	3370947
35	4986265
36	7354573
37	10779763
38	15804901
39	23102271
40	33685239

[1, 1, 1, 3, 3, 7, 13, 19, 31, 57, 99, 145, 253, 391, 661, 1071, 1647, 2617, 4189, 6439, 10183, 15999, 24195, 37537, 57553, 87925, 132841, 202899, 306147, 458827, 688501, 1030147, 1533535, 2280549, 3370947, 4986265, 7354573, 10779763, 15804901, 23102271, 33685239]

cp's OEIS Frontend

A306665 Expansion of Sum_{k>=0} k! * x^(k*(k+1)/2) / Product_{j=1..k} (1 - x^j)^j.

Table of values

List of values