A327764 - cp's OEIS frontend

A327764 Expansion of 1 / (1 - Sum_{i>=1, j>=1} x^(ij(j + 1)/2)).

n	a(n)
0	1
1	1
2	2
3	5
4	10
5	21
6	47
7	99
8	211
9	455
10	973
11	2081
12	4464
13	9558
14	20466
15	43848
16	93914
17	201140
18	430844
19	922818
20	1976553
21	4233613
22	9067960
23	19422576
24	41601229
25	89105550
26	190854784
27	408791400
28	875589076
29	1875421302
30	4016959325
31	8603912899
32	18428694036
33	39472363286

[1, 1, 2, 5, 10, 21, 47, 99, 211, 455, 973, 2081, 4464, 9558, 20466, 43848, 93914, 201140, 430844, 922818, 1976553, 4233613, 9067960, 19422576, 41601229, 89105550, 190854784, 408791400, 875589076, 1875421302, 4016959325, 8603912899, 18428694036, 39472363286]

cp's OEIS Frontend

A327764 Expansion of 1 / (1 - Sum_{i>=1, j>=1} x^(ij(j + 1)/2)).

Table of values

List of values

cp's OEIS Frontend

A327764 Expansion of 1 / (1 - Sum_{i>=1, j>=1} x^(i*j*(j + 1)/2)).

Table of values

List of values

A327764 Expansion of 1 / (1 - Sum_{i>=1, j>=1} x^(ij(j + 1)/2)).