A246653 - cp's OEIS frontend

A246653 G.f.: Sum_{n>=0} x^n / (1-x^2)^(2n+1) [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * x^(2*k)].

n	a(n)
0	1
1	1
2	3
3	9
4	25
5	87
6	287
7	993
8	3519
9	12525
10	45369
11	165519
12	608569
13	2253307
14	8386575
15	31370297
16	117834837
17	444258387
18	1680516731
19	6375706325
20	24253227159
21	92481509389
22	353417696625
23	1353280137975
24	5191349266275
25	19948136148837
26	76771074483837
27	295880290515411
28	1141860205058433
29	4412129801125275

[1, 1, 3, 9, 25, 87, 287, 993, 3519, 12525, 45369, 165519, 608569, 2253307, 8386575, 31370297, 117834837, 444258387, 1680516731, 6375706325, 24253227159, 92481509389, 353417696625, 1353280137975, 5191349266275, 19948136148837, 76771074483837, 295880290515411, 1141860205058433, 4412129801125275]

cp's OEIS Frontend

A246653 G.f.: Sum_{n>=0} x^n / (1-x^2)^(2n+1) [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * x^(2*k)].

Table of values

List of values

cp's OEIS Frontend

A246653 G.f.: Sum_{n>=0} x^n / (1-x^2)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * x^(2*k)].

Table of values

List of values

A246653 G.f.: Sum_{n>=0} x^n / (1-x^2)^(2n+1) [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * x^(2*k)].