A383884 - cp's OEIS frontend

A383884 a(n) = Sum_{k=0..n} 2^k * binomial(2n+1,k) binomial(2*n-k,n-k).

n	a(n)
0	1
1	8
2	76
3	776
4	8236
5	89528
6	989080
7	11055248
8	124659148
9	1415338328
10	16157960776
11	185298481904
12	2133004809976
13	24631812347696
14	285225658980016
15	3310631101181216
16	38506555289077516
17	448698354100917656
18	5236993294930652776
19	61212903131657378096
20	716430640316516361256

[1, 8, 76, 776, 8236, 89528, 989080, 11055248, 124659148, 1415338328, 16157960776, 185298481904, 2133004809976, 24631812347696, 285225658980016, 3310631101181216, 38506555289077516, 448698354100917656, 5236993294930652776, 61212903131657378096, 716430640316516361256]

cp's OEIS Frontend

A383884 a(n) = Sum_{k=0..n} 2^k * binomial(2n+1,k) binomial(2*n-k,n-k).

Table of values

List of values

cp's OEIS Frontend

A383884 a(n) = Sum_{k=0..n} 2^k * binomial(2*n+1,k) * binomial(2*n-k,n-k).

Table of values

List of values

A383884 a(n) = Sum_{k=0..n} 2^k * binomial(2n+1,k) binomial(2*n-k,n-k).