A218225 - cp's OEIS frontend

A218225 G.f. A(x) satisfies: (1 - xA(x)) / (1 - x^2A(x)^2)^2 = 1 - x.

n	a(n)
0	1
1	2
2	6
3	23
4	101
5	480
6	2400
7	12434
8	66142
9	359112
10	1981904
11	11085198
12	62696874
13	357970472
14	2060459256
15	11943445311
16	69656978837
17	408466559630
18	2406825745010
19	14243262687023
20	84618295006269
21	504485687485408
22	3017344000161296
23	18099717207764928

[1, 2, 6, 23, 101, 480, 2400, 12434, 66142, 359112, 1981904, 11085198, 62696874, 357970472, 2060459256, 11943445311, 69656978837, 408466559630, 2406825745010, 14243262687023, 84618295006269, 504485687485408, 3017344000161296, 18099717207764928]

cp's OEIS Frontend

A218225 G.f. A(x) satisfies: (1 - xA(x)) / (1 - x^2A(x)^2)^2 = 1 - x.

Table of values

List of values

cp's OEIS Frontend

A218225 G.f. A(x) satisfies: (1 - x*A(x)) / (1 - x^2*A(x)^2)^2 = 1 - x.

Table of values

List of values

A218225 G.f. A(x) satisfies: (1 - xA(x)) / (1 - x^2A(x)^2)^2 = 1 - x.