A190904 - cp's OEIS frontend

A190904 a(n) = Sum_{k=0..n-1} cos(Pik/2)binomial(n-1,k)a(n-1-k)a(k) for n > 0, a(0) = 1.

n	a(n)
0	1
1	1
2	1
3	0
4	-3
5	-12
6	-27
7	0
8	441
9	3024
10	11529
11	0
12	-442827
13	-4390848
14	-23444883
15	0
16	1636819569
17	21224560896
18	145703137041
19	0
20	-16106380394643
21	-257991277243392
22	-2164638920874507
23	0
24	347592265948756521

[1, 1, 1, 0, -3, -12, -27, 0, 441, 3024, 11529, 0, -442827, -4390848, -23444883, 0, 1636819569, 21224560896, 145703137041, 0, -16106380394643, -257991277243392, -2164638920874507, 0, 347592265948756521]

cp's OEIS Frontend

A190904 a(n) = Sum_{k=0..n-1} cos(Pik/2)binomial(n-1,k)a(n-1-k)a(k) for n > 0, a(0) = 1.

Table of values

List of values

cp's OEIS Frontend

A190904 a(n) = Sum_{k=0..n-1} cos(Pi*k/2)*binomial(n-1,k)*a(n-1-k)*a(k) for n > 0, a(0) = 1.

Table of values

List of values

A190904 a(n) = Sum_{k=0..n-1} cos(Pik/2)binomial(n-1,k)a(n-1-k)a(k) for n > 0, a(0) = 1.