A337169 - cp's OEIS frontend

A337169 a(n) = (-1)^n + 3 * Sum_{k=0..n-1} a(k) * a(n-k-1).

n	a(n)
0	1
1	2
2	13
3	89
4	691
5	5720
6	49555
7	443630
8	4071595
9	38105342
10	362271823
11	3488988101
12	33967656469
13	333752559392
14	3305347855573
15	32960499084305
16	330664662067795
17	3335002912108670
18	33796042027030855
19	343940115478559699
20	3513702627928096681
21	36021007341027948032

[1, 2, 13, 89, 691, 5720, 49555, 443630, 4071595, 38105342, 362271823, 3488988101, 33967656469, 333752559392, 3305347855573, 32960499084305, 330664662067795, 3335002912108670, 33796042027030855, 343940115478559699, 3513702627928096681, 36021007341027948032]

cp's OEIS Frontend

A337169 a(n) = (-1)^n + 3 * Sum_{k=0..n-1} a(k) * a(n-k-1).

Table of values

List of values