A379087 - cp's OEIS frontend

A379087 a(n) = Sum_{k=0..floor(n/3)} binomial(3n+k-1,k) binomial(3n+k,n-3k).

n	a(n)
0	1
1	3
2	15
3	93
4	651
5	4803
6	36177
7	275208
8	2108091
9	16243671
10	125817345
11	978933354
12	7646000421
13	59915086026
14	470820659940
15	3708756501018
16	29276677544619
17	231540519752376
18	1834228504348863
19	14552075416977531
20	115605043235217081
21	919503729585453147

[1, 3, 15, 93, 651, 4803, 36177, 275208, 2108091, 16243671, 125817345, 978933354, 7646000421, 59915086026, 470820659940, 3708756501018, 29276677544619, 231540519752376, 1834228504348863, 14552075416977531, 115605043235217081, 919503729585453147]

cp's OEIS Frontend

A379087 a(n) = Sum_{k=0..floor(n/3)} binomial(3n+k-1,k) binomial(3n+k,n-3k).

Table of values

List of values

cp's OEIS Frontend

A379087 a(n) = Sum_{k=0..floor(n/3)} binomial(3*n+k-1,k) * binomial(3*n+k,n-3*k).

Table of values

List of values

A379087 a(n) = Sum_{k=0..floor(n/3)} binomial(3n+k-1,k) binomial(3n+k,n-3k).