A386862 - cp's OEIS frontend

A386862 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(2n+1,k) binomial(2*n-k-1,n-k).

n	a(n)
0	1
1	5
2	42
3	409
4	4238
5	45414
6	496996
7	5517929
8	61909878
9	700189606
10	7968994124
11	91158632250
12	1047156227068
13	12071222381456
14	139569181458552
15	1617879480097129
16	18796461329347238
17	218806784598226926
18	2551538498649588892
19	29800118958422522414
20	348529038403155280548

[1, 5, 42, 409, 4238, 45414, 496996, 5517929, 61909878, 700189606, 7968994124, 91158632250, 1047156227068, 12071222381456, 139569181458552, 1617879480097129, 18796461329347238, 218806784598226926, 2551538498649588892, 29800118958422522414, 348529038403155280548]

cp's OEIS Frontend

A386862 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(2n+1,k) binomial(2*n-k-1,n-k).

Table of values

List of values

cp's OEIS Frontend

A386862 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(2*n+1,k) * binomial(2*n-k-1,n-k).

Table of values

List of values

A386862 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(2n+1,k) binomial(2*n-k-1,n-k).