A254747 - cp's OEIS frontend

A254747 a(n) = (1 + Sum_{j=0..n} (C(n,j)C(3j-1,j))) / 2.

n	a(n)
0	1
1	2
2	8
3	47
4	312
5	2162
6	15311
7	109965
8	797824
9	5833298
10	42910998
11	317224800
12	2354712927
13	17538747124
14	131017428431
15	981194304302
16	7364370502896
17	55380344444150
18	417176211054422
19	3147365470080480
20	23777750075552262

[1, 2, 8, 47, 312, 2162, 15311, 109965, 797824, 5833298, 42910998, 317224800, 2354712927, 17538747124, 131017428431, 981194304302, 7364370502896, 55380344444150, 417176211054422, 3147365470080480, 23777750075552262]

cp's OEIS Frontend

A254747 a(n) = (1 + Sum_{j=0..n} (C(n,j)C(3j-1,j))) / 2.

Table of values

List of values

cp's OEIS Frontend

A254747 a(n) = (1 + Sum_{j=0..n} (C(n,j)*C(3*j-1,j))) / 2.

Table of values

List of values

A254747 a(n) = (1 + Sum_{j=0..n} (C(n,j)C(3j-1,j))) / 2.