A386868 - cp's OEIS frontend

A386868 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(2n+2,k) binomial(2*n-k,n-k).

n	a(n)
0	1
1	8
2	75
3	760
4	8030
5	87036
6	959623
7	10710320
8	120635550
9	1368461440
10	15611831774
11	178932199152
12	2058727445320
13	23764328143220
14	275083791201375
15	3191938947518560
16	37116092204482550
17	432393735569959440
18	5045632228616597290
19	58965061323736782800
20	690005032437397594260

[1, 8, 75, 760, 8030, 87036, 959623, 10710320, 120635550, 1368461440, 15611831774, 178932199152, 2058727445320, 23764328143220, 275083791201375, 3191938947518560, 37116092204482550, 432393735569959440, 5045632228616597290, 58965061323736782800, 690005032437397594260]

cp's OEIS Frontend

A386868 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(2n+2,k) binomial(2*n-k,n-k).

Table of values

List of values

cp's OEIS Frontend

A386868 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(2*n+2,k) * binomial(2*n-k,n-k).

Table of values

List of values

A386868 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(2n+2,k) binomial(2*n-k,n-k).