A084605 - cp's OEIS frontend

A084605 G.f.: 1/(1-2x-15x^2)^(1/2); also, a(n) is the central coefficient of (1+x+4x^2)^n.

n	a(n)
0	1
1	1
2	9
3	25
4	145
5	561
6	2841
7	12489
8	60705
9	281185
10	1353769
11	6418809
12	30917041
13	148331665
14	716698425
15	3462260265
16	16786700865
17	81464917185
18	396215601225
19	1929237099225
20	9408084660945
21	45928695279345
22	224476389327705

[1, 1, 9, 25, 145, 561, 2841, 12489, 60705, 281185, 1353769, 6418809, 30917041, 148331665, 716698425, 3462260265, 16786700865, 81464917185, 396215601225, 1929237099225, 9408084660945, 45928695279345, 224476389327705]

cp's OEIS Frontend

A084605 G.f.: 1/(1-2x-15x^2)^(1/2); also, a(n) is the central coefficient of (1+x+4x^2)^n.

Table of values

List of values