A386835 - cp's OEIS frontend

A386835 a(n) = Sum_{k=0..n} binomial(2n+2,k) binomial(2*n-k-1,n-k).

n	a(n)
0	1
1	5
2	30
3	198
4	1375
5	9843
6	71876
7	532220
8	3981645
9	30023265
10	227803642
11	1737227682
12	13303481035
13	102234258623
14	787997000640
15	6089345072056
16	47161769198809
17	365986358229645
18	2845097133606422
19	22151577531840830
20	172710278146819959
21	1348274852150114251

[1, 5, 30, 198, 1375, 9843, 71876, 532220, 3981645, 30023265, 227803642, 1737227682, 13303481035, 102234258623, 787997000640, 6089345072056, 47161769198809, 365986358229645, 2845097133606422, 22151577531840830, 172710278146819959, 1348274852150114251]

cp's OEIS Frontend

A386835 a(n) = Sum_{k=0..n} binomial(2n+2,k) binomial(2*n-k-1,n-k).

Table of values

List of values

cp's OEIS Frontend

A386835 a(n) = Sum_{k=0..n} binomial(2*n+2,k) * binomial(2*n-k-1,n-k).

Table of values

List of values

A386835 a(n) = Sum_{k=0..n} binomial(2n+2,k) binomial(2*n-k-1,n-k).