A281810 - cp's OEIS frontend

A281810 Expansion of Sum_{i>=1} x^(i(i+1)/2) / (1 - Sum_{j>=1} x^(j(j+1)/2))^2.

n	a(n)
1	1
2	2
3	4
4	8
5	14
6	25
7	45
8	77
9	131
10	224
11	377
12	629
13	1049
14	1738
15	2863
16	4708
17	7716
18	12598
19	20524
20	33363
21	54102
22	87567
23	141489
24	228216
25	367538
26	591098
27	949372
28	1522917
29	2440190
30	3905747
31	6245198
32	9976535
33	15923083
34	25392755
35	40462155
36	64426278
37	102510580
38	162997910
39	259010672
40	411328655
41	652842792
42	1035591110

[1, 2, 4, 8, 14, 25, 45, 77, 131, 224, 377, 629, 1049, 1738, 2863, 4708, 7716, 12598, 20524, 33363, 54102, 87567, 141489, 228216, 367538, 591098, 949372, 1522917, 2440190, 3905747, 6245198, 9976535, 15923083, 25392755, 40462155, 64426278, 102510580, 162997910, 259010672, 411328655, 652842792, 1035591110]

cp's OEIS Frontend

A281810 Expansion of Sum_{i>=1} x^(i(i+1)/2) / (1 - Sum_{j>=1} x^(j(j+1)/2))^2.

Table of values

List of values

cp's OEIS Frontend

A281810 Expansion of Sum_{i>=1} x^(i*(i+1)/2) / (1 - Sum_{j>=1} x^(j*(j+1)/2))^2.

Table of values

List of values

A281810 Expansion of Sum_{i>=1} x^(i(i+1)/2) / (1 - Sum_{j>=1} x^(j(j+1)/2))^2.