A305460 - cp's OEIS frontend

A305460 a(0) = 1, a(1) = 3, a(n) = 3na(n-1) + 2*a(n-2).

n	a(n)
0	1
1	3
2	20
3	186
4	2272
5	34452
6	624680
7	13187184
8	317741776
9	8605402320
10	258797553152
11	8557530058656
12	308588677217920
13	12052073471616192
14	506804263162315904
15	22830295989247448064
16	1096867816010202138880
17	55985919208498803979008

[1, 3, 20, 186, 2272, 34452, 624680, 13187184, 317741776, 8605402320, 258797553152, 8557530058656, 308588677217920, 12052073471616192, 506804263162315904, 22830295989247448064, 1096867816010202138880, 55985919208498803979008]

cp's OEIS Frontend

A305460 a(0) = 1, a(1) = 3, a(n) = 3na(n-1) + 2*a(n-2).

Table of values

List of values

cp's OEIS Frontend

A305460 a(0) = 1, a(1) = 3, a(n) = 3*n*a(n-1) + 2*a(n-2).

Table of values

List of values

A305460 a(0) = 1, a(1) = 3, a(n) = 3na(n-1) + 2*a(n-2).