A370099 - cp's OEIS frontend

A370099 a(n) = Sum_{k=0..n} binomial(2n,k) binomial(3*n-k-1,n-k).

n	a(n)
0	1
1	4
2	32
3	292
4	2816
5	28004
6	284000
7	2919620
8	30316544
9	317222212
10	3339504032
11	35329425124
12	375282559232
13	4000059761572
14	42760427177696
15	458259268924292
16	4921911787962368
17	52965710906750084
18	570951048018417440
19	6164049197776406180
20	66639047280436354816

[1, 4, 32, 292, 2816, 28004, 284000, 2919620, 30316544, 317222212, 3339504032, 35329425124, 375282559232, 4000059761572, 42760427177696, 458259268924292, 4921911787962368, 52965710906750084, 570951048018417440, 6164049197776406180, 66639047280436354816]

cp's OEIS Frontend

A370099 a(n) = Sum_{k=0..n} binomial(2n,k) binomial(3*n-k-1,n-k).

Table of values

List of values

cp's OEIS Frontend

A370099 a(n) = Sum_{k=0..n} binomial(2*n,k) * binomial(3*n-k-1,n-k).

Table of values

List of values

A370099 a(n) = Sum_{k=0..n} binomial(2n,k) binomial(3*n-k-1,n-k).