A386920 - cp's OEIS frontend

A386920 a(n) = Sum_{k=0..n} binomial(4n,k) binomial(3*n-k,n-k).

n	a(n)
0	1
1	7
2	83
3	1102
4	15395
5	221402
6	3244430
7	48173244
8	722264355
9	10910288290
10	165788618138
11	2531447611524
12	38807906496398
13	596945491933252
14	9208704207465020
15	142410375212008952
16	2207122379129757987
17	34272045530904650610
18	533075544700619580002
19	8304126391210396590900

[1, 7, 83, 1102, 15395, 221402, 3244430, 48173244, 722264355, 10910288290, 165788618138, 2531447611524, 38807906496398, 596945491933252, 9208704207465020, 142410375212008952, 2207122379129757987, 34272045530904650610, 533075544700619580002, 8304126391210396590900]

cp's OEIS Frontend

A386920 a(n) = Sum_{k=0..n} binomial(4n,k) binomial(3*n-k,n-k).

Table of values

List of values

cp's OEIS Frontend

A386920 a(n) = Sum_{k=0..n} binomial(4*n,k) * binomial(3*n-k,n-k).

Table of values

List of values

A386920 a(n) = Sum_{k=0..n} binomial(4n,k) binomial(3*n-k,n-k).