A210657 - cp's OEIS frontend

A210657 a(0)=1; thereafter a(n) = -2Sum_{k=1..n} binomial(2n,2k)a(n-k).

n	a(n)
0	1
1	-2
2	22
3	-602
4	30742
5	-2523002
6	303692662
7	-50402079002
8	11030684333782
9	-3077986048956602
10	1066578948824962102
11	-449342758735568563802
12	226182806795367665865622
13	-134065091768709178087428602
14	92423044260377387363207812342
15	-73323347841467639992211297199002

[1, -2, 22, -602, 30742, -2523002, 303692662, -50402079002, 11030684333782, -3077986048956602, 1066578948824962102, -449342758735568563802, 226182806795367665865622, -134065091768709178087428602, 92423044260377387363207812342, -73323347841467639992211297199002]

cp's OEIS Frontend

A210657 a(0)=1; thereafter a(n) = -2Sum_{k=1..n} binomial(2n,2k)a(n-k).

Table of values

List of values

cp's OEIS Frontend

A210657 a(0)=1; thereafter a(n) = -2*Sum_{k=1..n} binomial(2n,2k)*a(n-k).

Table of values

List of values

A210657 a(0)=1; thereafter a(n) = -2Sum_{k=1..n} binomial(2n,2k)a(n-k).