n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 48 |
8 | 115 |
9 | 286 |
10 | 719 |
11 | 1841 |
12 | 4755 |
13 | 12410 |
14 | 32558 |
15 | 85849 |
16 | 226980 |
17 | 601373 |
18 | 1594870 |
19 | 4232100 |
20 | 11230771 |
21 | 29798539 |
22 | 79034638 |
23 | 209526631 |
24 | 555172356 |
25 | 1470195001 |
26 | 3891131705 |
27 | 10292857772 |
28 | 27212082536 |
29 | 71905725130 |
30 | 189911518888 |
[1,1,1,2,4,9,20,48,115,286,719,1841,4755,12410, 32558,85849,226980,601373,1594870,4232100, 11230771,29798539,79034638,209526631,555172356, 1470195001,3891131705,10292857772,27212082536, 71905725130,189911518888] |