A157309 - cp's OEIS frontend

A157309 G.f. A(x) satisfies the condition that both A(x) and F(x) = A(x*F(x)) = o.g.f. of A157310 have zeros for every other coefficient after initial terms; g.f. of dual sequence A157308 satisfies the same condition.

n	a(n)
0	1
1	1
2	0
3	-1
4	0
5	9
6	0
7	-176
8	0
9	5693
10	0
11	-272185
12	0
13	18043492
14	0
15	-1587355800
16	0
17	179258676373
18	0
19	-25305967691715
20	0
21	4370075849887361
22	0
23	-906689353191842372
24	0
25	222613537277330398444
26	0
27	-63850898347335510126988

[1, 1, 0, -1, 0, 9, 0, -176, 0, 5693, 0, -272185, 0, 18043492, 0, -1587355800, 0, 179258676373, 0, -25305967691715, 0, 4370075849887361, 0, -906689353191842372, 0, 222613537277330398444, 0, -63850898347335510126988]

cp's OEIS Frontend

A157309 G.f. A(x) satisfies the condition that both A(x) and F(x) = A(x*F(x)) = o.g.f. of A157310 have zeros for every other coefficient after initial terms; g.f. of dual sequence A157308 satisfies the same condition.

Table of values

List of values