A103882 - cp's OEIS frontend

A103882 a(n) = Sum_{i=0..n} C(n+1,i)C(n-1,i-1)C(2n-i,n).

n	a(n)
0	1
1	2
2	12
3	92
4	780
5	7002
6	65226
7	623576
8	6077196
9	60110030
10	601585512
11	6078578508
12	61908797418
13	634756203018
14	6545498596110
15	67830161708592
16	705951252118284
17	7375213677918294
18	77310179609631564
19	812839595630249540
20	8569327862277434280
21	90562666977432643862

[1, 2, 12, 92, 780, 7002, 65226, 623576, 6077196, 60110030, 601585512, 6078578508, 61908797418, 634756203018, 6545498596110, 67830161708592, 705951252118284, 7375213677918294, 77310179609631564, 812839595630249540, 8569327862277434280, 90562666977432643862]

cp's OEIS Frontend

A103882 a(n) = Sum_{i=0..n} C(n+1,i)C(n-1,i-1)C(2n-i,n).

Table of values

List of values

cp's OEIS Frontend

A103882 a(n) = Sum_{i=0..n} C(n+1,i)*C(n-1,i-1)*C(2n-i,n).

Table of values

List of values

A103882 a(n) = Sum_{i=0..n} C(n+1,i)C(n-1,i-1)C(2n-i,n).