A130579 - cp's OEIS frontend

A130579 Convolution of A000108 (Catalan numbers) and A001764 (ternary trees): a(n) = Sum_{k=0..n} C(2k,k) * C(3(n-k),n-k) / [(k+1)(2(n-k)+1)].

n	a(n)
0	1
1	2
2	6
3	22
4	92
5	423
6	2087
7	10856
8	58765
9	327877
10	1872490
11	10890483
12	64267612
13	383773529
14	2314271146
15	14071475748
16	86165249745
17	530862665988
18	3288219482754
19	20464419717069
20	127901478759153
21	802421158028657

[1, 2, 6, 22, 92, 423, 2087, 10856, 58765, 327877, 1872490, 10890483, 64267612, 383773529, 2314271146, 14071475748, 86165249745, 530862665988, 3288219482754, 20464419717069, 127901478759153, 802421158028657]

cp's OEIS Frontend

A130579 Convolution of A000108 (Catalan numbers) and A001764 (ternary trees): a(n) = Sum_{k=0..n} C(2k,k) * C(3(n-k),n-k) / [(k+1)(2(n-k)+1)].

Table of values

List of values