A383326 - cp's OEIS frontend

A383326 a(n) = Sum_{k=0..n} binomial(3n+1,k) binomial(3*n-k,n-k).

n	a(n)
0	1
1	7
2	71
3	799
4	9439
5	114687
6	1419263
7	17791487
8	225172991
9	2870945791
10	36819740671
11	474470776831
12	6138443497471
13	79681448443903
14	1037278449106943
15	13536444411412479
16	177030837540093951
17	2319618918724403199
18	30444928900076666879
19	400189735705069486079
20	5267487129636270243839

[1, 7, 71, 799, 9439, 114687, 1419263, 17791487, 225172991, 2870945791, 36819740671, 474470776831, 6138443497471, 79681448443903, 1037278449106943, 13536444411412479, 177030837540093951, 2319618918724403199, 30444928900076666879, 400189735705069486079, 5267487129636270243839]

cp's OEIS Frontend

A383326 a(n) = Sum_{k=0..n} binomial(3n+1,k) binomial(3*n-k,n-k).

Table of values

List of values

cp's OEIS Frontend

A383326 a(n) = Sum_{k=0..n} binomial(3*n+1,k) * binomial(3*n-k,n-k).

Table of values

List of values

A383326 a(n) = Sum_{k=0..n} binomial(3n+1,k) binomial(3*n-k,n-k).