A386863 - cp's OEIS frontend

A386863 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(3n+1,k) binomial(3*n-k-1,n-k).

n	a(n)
0	1
1	8
2	117
3	1948
4	34283
5	622272
6	11519692
7	216193460
8	4098365799
9	78293227384
10	1504814127893
11	29066030323920
12	563717999500852
13	10970568626688704
14	214125123753359544
15	4189892211091193380
16	82166338354628744159
17	1614453403457943056184
18	31776198133079795063887

[1, 8, 117, 1948, 34283, 622272, 11519692, 216193460, 4098365799, 78293227384, 1504814127893, 29066030323920, 563717999500852, 10970568626688704, 214125123753359544, 4189892211091193380, 82166338354628744159, 1614453403457943056184, 31776198133079795063887]

cp's OEIS Frontend

A386863 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(3n+1,k) binomial(3*n-k-1,n-k).

Table of values

List of values

cp's OEIS Frontend

A386863 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(3*n+1,k) * binomial(3*n-k-1,n-k).

Table of values

List of values

A386863 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(3n+1,k) binomial(3*n-k-1,n-k).