A085480 - cp's OEIS frontend

A085480 Expansion of 3x(1+2x)/(1-3x-3*x^2).

n	a(n)
1	0
2	3
3	15
4	54
5	207
6	783
7	2970
8	11259
9	42687
10	161838
11	613575
12	2326239
13	8819442
14	33437043
15	126769455
16	480619494
17	1822166847
18	6908359023
19	26191577610
20	99299809899
21	376474162527
22	1427321917278
23	5411388239415
24	20516130470079

[0, 3, 15, 54, 207, 783, 2970, 11259, 42687, 161838, 613575, 2326239, 8819442, 33437043, 126769455, 480619494, 1822166847, 6908359023, 26191577610, 99299809899, 376474162527, 1427321917278, 5411388239415, 20516130470079]

cp's OEIS Frontend

A085480 Expansion of 3x(1+2x)/(1-3x-3*x^2).

Table of values

List of values

cp's OEIS Frontend

A085480 Expansion of 3*x*(1+2*x)/(1-3*x-3*x^2).

Table of values

List of values

A085480 Expansion of 3x(1+2x)/(1-3x-3*x^2).