A156296 - cp's OEIS frontend

A156296 a(1)=1, a(n) = 2 * Sum_{k=1..n-1} (3^k-1)/2 * a(k) for n>=2.

n	a(n)
0	1
1	2
2	10
3	140
4	5740
5	700280
6	255602200
7	279628806800
8	917462115110800
9	9029662136920493600
10	266600774592577573540000
11	23613897008762965998731960000
12	6274708327065504088149055143160000

[1, 2, 10, 140, 5740, 700280, 255602200, 279628806800, 917462115110800, 9029662136920493600, 266600774592577573540000, 23613897008762965998731960000, 6274708327065504088149055143160000]

cp's OEIS Frontend

A156296 a(1)=1, a(n) = 2 * Sum_{k=1..n-1} (3^k-1)/2 * a(k) for n>=2.

Table of values

List of values