A369226 - cp's OEIS frontend

A369226 Expansion of (1/x) * Series_Reversion( x * (1-x) / (1+x^2)^2 ).

n	a(n)
0	1
1	1
2	4
3	13
4	53
5	220
6	968
7	4373
8	20271
9	95705
10	458904
11	2228220
12	10934524
13	54143848
14	270189008
15	1357428997
16	6860264323
17	34853234867
18	177900211204
19	911867479717
20	4691701977973
21	24222505191984
22	125448280976224
23	651555603531308
24	3392951906596708
25	17711433386188300

[1, 1, 4, 13, 53, 220, 968, 4373, 20271, 95705, 458904, 2228220, 10934524, 54143848, 270189008, 1357428997, 6860264323, 34853234867, 177900211204, 911867479717, 4691701977973, 24222505191984, 125448280976224, 651555603531308, 3392951906596708, 17711433386188300]

cp's OEIS Frontend

A369226 Expansion of (1/x) * Series_Reversion( x * (1-x) / (1+x^2)^2 ).

Table of values

List of values