A215576 - cp's OEIS frontend

A215576 G.f. satisfies A(x) = (1 + x^2)(1 + xA(x)^2).

n	a(n)
0	1
1	1
2	3
3	8
4	24
5	80
6	278
7	997
8	3670
9	13782
10	52588
11	203314
12	794726
13	3135540
14	12470444
15	49942305
16	201233170
17	815205699
18	3318291966
19	13565162636
20	55669063762
21	229257178198
22	947142023262
23	3924380904498
24	16303716754884
25	67899954924360
26	283425070356740
27	1185551594834910

[1, 1, 3, 8, 24, 80, 278, 997, 3670, 13782, 52588, 203314, 794726, 3135540, 12470444, 49942305, 201233170, 815205699, 3318291966, 13565162636, 55669063762, 229257178198, 947142023262, 3924380904498, 16303716754884, 67899954924360, 283425070356740, 1185551594834910]

cp's OEIS Frontend

A215576 G.f. satisfies A(x) = (1 + x^2)(1 + xA(x)^2).

Table of values

List of values

cp's OEIS Frontend

A215576 G.f. satisfies A(x) = (1 + x^2)*(1 + x*A(x)^2).

Table of values

List of values

A215576 G.f. satisfies A(x) = (1 + x^2)(1 + xA(x)^2).