A157307 - cp's OEIS frontend

A157307 G.f. A(x) satisfies the condition that both A(x) and F(x) = A(x/F(x)^2) have zeros for every other coefficient after initial terms; g.f. of dual sequence A157304 satisfies the same condition.

n	a(n)
0	1
1	1
2	0
3	-7
4	0
5	242
6	0
7	-17771
8	0
9	2189294
10	0
11	-404590470
12	0
13	104785114020
14	0
15	-36267349272243
16	0
17	16185534555969878
18	0
19	-9056084951164614194
20	0
21	6210575966204050489916
22	0
23	-5124228589785627978616702
24	0

[1, 1, 0, -7, 0, 242, 0, -17771, 0, 2189294, 0, -404590470, 0, 104785114020, 0, -36267349272243, 0, 16185534555969878, 0, -9056084951164614194, 0, 6210575966204050489916, 0, -5124228589785627978616702, 0]

cp's OEIS Frontend

A157307 G.f. A(x) satisfies the condition that both A(x) and F(x) = A(x/F(x)^2) have zeros for every other coefficient after initial terms; g.f. of dual sequence A157304 satisfies the same condition.

Table of values

List of values