A378426 - cp's OEIS frontend

A378426 Expansion of (1/x) * Series_Reversion( x / (1 + x + x^2 * (1 + x)^2) ).

n	a(n)
0	1
1	1
2	2
3	6
4	18
5	56
6	184
7	624
8	2161
9	7621
10	27283
11	98869
12	361967
13	1336843
14	4974763
15	18634683
16	70207751
17	265874119
18	1011475368
19	3863846328
20	14814818017
21	56994831109
22	219941836172
23	851138940402
24	3302281633591
25	12842844277471
26	50056915575566
27	195503017533502

[1, 1, 2, 6, 18, 56, 184, 624, 2161, 7621, 27283, 98869, 361967, 1336843, 4974763, 18634683, 70207751, 265874119, 1011475368, 3863846328, 14814818017, 56994831109, 219941836172, 851138940402, 3302281633591, 12842844277471, 50056915575566, 195503017533502]

cp's OEIS Frontend

A378426 Expansion of (1/x) * Series_Reversion( x / (1 + x + x^2 * (1 + x)^2) ).

Table of values

List of values