A307733 - cp's OEIS frontend

A307733 a(0) = a(1) = 1; a(n) = a(n-1) + a(n-2) + Sum_{k=0..n-1} a(k) * a(n-k-1).

n	a(n)
0	1
1	1
2	4
3	14
4	54
5	220
6	934
7	4090
8	18344
9	83850
10	389214
11	1829736
12	8693962
13	41685714
14	201442188
15	980091814
16	4797070022
17	23603701828
18	116688837886
19	579312087802
20	2887020896016
21	14437318756818
22	72424982972862
23	364366674463824
24	1837954750285458

[1, 1, 4, 14, 54, 220, 934, 4090, 18344, 83850, 389214, 1829736, 8693962, 41685714, 201442188, 980091814, 4797070022, 23603701828, 116688837886, 579312087802, 2887020896016, 14437318756818, 72424982972862, 364366674463824, 1837954750285458]

cp's OEIS Frontend

A307733 a(0) = a(1) = 1; a(n) = a(n-1) + a(n-2) + Sum_{k=0..n-1} a(k) * a(n-k-1).

Table of values

List of values