A324151 - cp's OEIS frontend

A324151 a(n) = (2/((n+1)(n+2)))multinomial(3*n;n,n,n).

n	a(n)
0	1
1	2
2	15
3	168
4	2310
5	36036
6	612612
7	11085360
8	210344706
9	4143153300
10	84106011990
11	1750346095680
12	37194854533200
13	804553314979680
14	17671438882589400
15	393345439598342880
16	8858467087621013610
17	201578121034100464500
18	4629577513083174001350
19	107211268724031397926000

[1, 2, 15, 168, 2310, 36036, 612612, 11085360, 210344706, 4143153300, 84106011990, 1750346095680, 37194854533200, 804553314979680, 17671438882589400, 393345439598342880, 8858467087621013610, 201578121034100464500, 4629577513083174001350, 107211268724031397926000]

cp's OEIS Frontend

A324151 a(n) = (2/((n+1)(n+2)))multinomial(3*n;n,n,n).

Table of values

List of values

cp's OEIS Frontend

A324151 a(n) = (2/((n+1)*(n+2)))*multinomial(3*n;n,n,n).

Table of values

List of values

A324151 a(n) = (2/((n+1)(n+2)))multinomial(3*n;n,n,n).