A100511 - cp's OEIS frontend

A100511 a(n) = Sum_{j=0..n} Sum_{k=0..n} binomial(n,j)binomial(n,k)max(j,k).

n	a(n)
0	0
1	3
2	22
3	126
4	652
5	3190
6	15060
7	69356
8	313624
9	1398438
10	6166660
11	26948548
12	116888232
13	503811516
14	2159864392
15	9216445080
16	39168381488
17	165864540934
18	700151508324
19	2947120122068
20	12373581565960
21	51831196048212
22	216659135089496
23	903925011410536

[0, 3, 22, 126, 652, 3190, 15060, 69356, 313624, 1398438, 6166660, 26948548, 116888232, 503811516, 2159864392, 9216445080, 39168381488, 165864540934, 700151508324, 2947120122068, 12373581565960, 51831196048212, 216659135089496, 903925011410536]

cp's OEIS Frontend

A100511 a(n) = Sum_{j=0..n} Sum_{k=0..n} binomial(n,j)binomial(n,k)max(j,k).

Table of values

List of values

cp's OEIS Frontend

A100511 a(n) = Sum_{j=0..n} Sum_{k=0..n} binomial(n,j)*binomial(n,k)*max(j,k).

Table of values

List of values

A100511 a(n) = Sum_{j=0..n} Sum_{k=0..n} binomial(n,j)binomial(n,k)max(j,k).