A188912 - cp's OEIS frontend

A188912 Binomial convolution of the binomial coefficients bin(3n,n)/(2n+1) (A001764).

n	a(n)
0	1
1	2
2	8
3	42
4	260
5	1816
6	13962
7	116094
8	1029124
9	9609144
10	93569808
11	942642696
12	9763181946
13	103455616400
14	1117379189926
15	12264816349938
16	136501928050116
17	1537591374945704
18	17503603786398576
19	201128739609458904
20	2330480521265639136

[1, 2, 8, 42, 260, 1816, 13962, 116094, 1029124, 9609144, 93569808, 942642696, 9763181946, 103455616400, 1117379189926, 12264816349938, 136501928050116, 1537591374945704, 17503603786398576, 201128739609458904, 2330480521265639136]

cp's OEIS Frontend

A188912 Binomial convolution of the binomial coefficients bin(3n,n)/(2n+1) (A001764).

Table of values

List of values