A277957 - cp's OEIS frontend

A277957 a(n) = (n+3)Sum_{i=0..n} binomial(3n-2i+2,n-i)/(2n-i+3).

n	a(n)
0	1
1	5
2	26
3	144
4	834
5	4979
6	30361
7	188003
8	1177694
9	7443721
10	47384897
11	303389530
12	1951806313
13	12607088771
14	81709809546
15	531138264252
16	3461366814726
17	22607751250442
18	147952881721126
19	969953549401499
20	6368831275489633

[1, 5, 26, 144, 834, 4979, 30361, 188003, 1177694, 7443721, 47384897, 303389530, 1951806313, 12607088771, 81709809546, 531138264252, 3461366814726, 22607751250442, 147952881721126, 969953549401499, 6368831275489633]

cp's OEIS Frontend

A277957 a(n) = (n+3)Sum_{i=0..n} binomial(3n-2i+2,n-i)/(2n-i+3).

Table of values

List of values

cp's OEIS Frontend

A277957 a(n) = (n+3)*Sum_{i=0..n} binomial(3*n-2*i+2,n-i)/(2*n-i+3).

Table of values

List of values

A277957 a(n) = (n+3)Sum_{i=0..n} binomial(3n-2i+2,n-i)/(2n-i+3).