A218074 - cp's OEIS frontend

A218074 Expansion of Sum_{n>=1} ((n-1) * q^(n*(n+1)/2) / Product_{k=1..n} (1 - q^k)).

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	2
6	4
7	5
8	7
9	10
10	15
11	18
12	25
13	31
14	41
15	53
16	66
17	81
18	103
19	125
20	154
21	190
22	229
23	276
24	333
25	399
26	475
27	568
28	673
29	794
30	938
31	1102
32	1289
33	1512
34	1760
35	2050
36	2384
37	2760
38	3190
39	3687
40	4246
41	4882
42	5609
43	6427
44	7354
45	8412
46	9592
47	10927
48	12439
49	14130
50	16033
51	18177
52	20573
53	23256
54	26271

[0, 0, 0, 1, 1, 2, 4, 5, 7, 10, 15, 18, 25, 31, 41, 53, 66, 81, 103, 125, 154, 190, 229, 276, 333, 399, 475, 568, 673, 794, 938, 1102, 1289, 1512, 1760, 2050, 2384, 2760, 3190, 3687, 4246, 4882, 5609, 6427, 7354, 8412, 9592, 10927, 12439, 14130, 16033, 18177, 20573, 23256, 26271]

cp's OEIS Frontend

A218074 Expansion of Sum_{n>=1} ((n-1) * q^(n*(n+1)/2) / Product_{k=1..n} (1 - q^k)).

Table of values

List of values