A370097 - cp's OEIS frontend

A370097 a(n) = Sum_{k=0..n} binomial(3n,k) binomial(3*n-k-1,n-k).

n	a(n)
0	1
1	5
2	49
3	545
4	6401
5	77505
6	956929
7	11976193
8	151388161
9	1928363009
10	24712450049
11	318255628289
12	4115300220929
13	53396370030593
14	694845537386497
15	9064787191660545
16	118516719269445633
17	1552528215946035201
18	20372392543502991361
19	267736366910401413121

[1, 5, 49, 545, 6401, 77505, 956929, 11976193, 151388161, 1928363009, 24712450049, 318255628289, 4115300220929, 53396370030593, 694845537386497, 9064787191660545, 118516719269445633, 1552528215946035201, 20372392543502991361, 267736366910401413121]

cp's OEIS Frontend

A370097 a(n) = Sum_{k=0..n} binomial(3n,k) binomial(3*n-k-1,n-k).

Table of values

List of values

cp's OEIS Frontend

A370097 a(n) = Sum_{k=0..n} binomial(3*n,k) * binomial(3*n-k-1,n-k).

Table of values

List of values

A370097 a(n) = Sum_{k=0..n} binomial(3n,k) binomial(3*n-k-1,n-k).