A132306 - cp's OEIS frontend

A132306 a(n) = Sum_{k=0..2n-1} C(2n-1,k)*trinomial(n,k) for n>0 with a(0)=1.

n	a(n)
0	1
1	2
2	18
3	179
4	1874
5	20202
6	221943
7	2470827
8	27777618
9	314642708
10	3585365618
11	41054041602
12	471980219543
13	5444542749674
14	62987391100239
15	730515277512729
16	8490829425196626
17	98878672140171984
18	1153433769999190212

[1, 2, 18, 179, 1874, 20202, 221943, 2470827, 27777618, 314642708, 3585365618, 41054041602, 471980219543, 5444542749674, 62987391100239, 730515277512729, 8490829425196626, 98878672140171984, 1153433769999190212]

cp's OEIS Frontend

A132306 a(n) = Sum_{k=0..2n-1} C(2n-1,k)*trinomial(n,k) for n>0 with a(0)=1.

Table of values

List of values