A013989 - cp's OEIS frontend

A013989 a(n) = (n+1)*(a(n-1)/n + a(n-2)), with a(0)=1, a(1)=2.

n	a(n)
0	1
1	2
2	6
3	16
4	50
5	156
6	532
7	1856
8	6876
9	26200
10	104456
11	428352
12	1821976
13	7959056
14	35857200
15	165592576
16	785514512
17	3812387616
18	18948962656
19	96194028800
20	498931946016
21	2638959243712
22	14234346694976

[1, 2, 6, 16, 50, 156, 532, 1856, 6876, 26200, 104456, 428352, 1821976, 7959056, 35857200, 165592576, 785514512, 3812387616, 18948962656, 96194028800, 498931946016, 2638959243712, 14234346694976]

cp's OEIS Frontend

A013989 a(n) = (n+1)*(a(n-1)/n + a(n-2)), with a(0)=1, a(1)=2.

Table of values

List of values