A370100 - cp's OEIS frontend

A370100 a(n) = Sum_{k=0..n} binomial(4n,k) binomial(2*n-k-1,n-k).

n	a(n)
0	1
1	5
2	47
3	500
4	5615
5	65005
6	767396
7	9183144
8	110995695
9	1351922495
10	16566597047
11	204010570296
12	2522556212228
13	31298015910140
14	389458822888280
15	4858487926378000
16	60742838865326319
17	760901358321592611
18	9547848458062427405
19	119990407515367475700

[1, 5, 47, 500, 5615, 65005, 767396, 9183144, 110995695, 1351922495, 16566597047, 204010570296, 2522556212228, 31298015910140, 389458822888280, 4858487926378000, 60742838865326319, 760901358321592611, 9547848458062427405, 119990407515367475700]

cp's OEIS Frontend

A370100 a(n) = Sum_{k=0..n} binomial(4n,k) binomial(2*n-k-1,n-k).

Table of values

List of values

cp's OEIS Frontend

A370100 a(n) = Sum_{k=0..n} binomial(4*n,k) * binomial(2*n-k-1,n-k).

Table of values

List of values

A370100 a(n) = Sum_{k=0..n} binomial(4n,k) binomial(2*n-k-1,n-k).