A112109 - cp's OEIS frontend

A112109 G.f. A(x) satisfies A(A(A(A(x)))) = B(x) (4th self-COMPOSE of A) such that the coefficients of B(x) consist only of numbers {1,2,3,4}, with B(0) = 0.

n	a(n)
1	1
2	1
3	-2
4	8
5	-38
6	194
7	-992
8	4777
9	-19831
10	56116
11	48008
12	-2062286
13	16053636
14	-70193968
15	155216743
16	-968038798
17	23817048561
18	-233579083166
19	333773365
20	21684104628935
21	-121906541882294
22	-2171063003748135
23	30425707365005935
24	192144123118329872

[1, 1, -2, 8, -38, 194, -992, 4777, -19831, 56116, 48008, -2062286, 16053636, -70193968, 155216743, -968038798, 23817048561, -233579083166, 333773365, 21684104628935, -121906541882294, -2171063003748135, 30425707365005935, 192144123118329872]

cp's OEIS Frontend

A112109 G.f. A(x) satisfies A(A(A(A(x)))) = B(x) (4th self-COMPOSE of A) such that the coefficients of B(x) consist only of numbers {1,2,3,4}, with B(0) = 0.

Table of values

List of values