A117187 - cp's OEIS frontend

A117187 Expansion of (1+x)c(x^2)/((1-x^2*c(x^2))sqrt(1-4x^2)), c(x) the g.f. of A000108.

n	a(n)
0	1
1	1
2	4
3	4
4	15
5	15
6	56
7	56
8	210
9	210
10	792
11	792
12	3003
13	3003
14	11440
15	11440
16	43758
17	43758
18	167960
19	167960
20	646646
21	646646
22	2496144
23	2496144
24	9657700
25	9657700
26	37442160
27	37442160
28	145422675
29	145422675
30	565722720

[1, 1, 4, 4, 15, 15, 56, 56, 210, 210, 792, 792, 3003, 3003, 11440, 11440, 43758, 43758, 167960, 167960, 646646, 646646, 2496144, 2496144, 9657700, 9657700, 37442160, 37442160, 145422675, 145422675, 565722720]

cp's OEIS Frontend

A117187 Expansion of (1+x)c(x^2)/((1-x^2*c(x^2))sqrt(1-4x^2)), c(x) the g.f. of A000108.

Table of values

List of values