A067336 - cp's OEIS frontend

A067336 a(0)=1, a(1)=2, a(n) = a(n-1)*9/2 - Catalan(n-1) where Catalan(n) = binomial(2n,n)/(n+1) = A000108(n).

n	a(n)
0	1
1	2
2	8
3	34
4	148
5	652
6	2892
7	12882
8	57540
9	257500
10	1153888
11	5175700
12	23231864
13	104335376
14	468766292
15	2106773874
16	9470787588
17	42583186476
18	191494694352
19	861248485884
20	3873850923288
21	17425765034376
22	78391476387672
23	352670161180884
24	1586672665700328
25	7138737091504152

[1, 2, 8, 34, 148, 652, 2892, 12882, 57540, 257500, 1153888, 5175700, 23231864, 104335376, 468766292, 2106773874, 9470787588, 42583186476, 191494694352, 861248485884, 3873850923288, 17425765034376, 78391476387672, 352670161180884, 1586672665700328, 7138737091504152]

cp's OEIS Frontend

A067336 a(0)=1, a(1)=2, a(n) = a(n-1)*9/2 - Catalan(n-1) where Catalan(n) = binomial(2n,n)/(n+1) = A000108(n).

Table of values

List of values