n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 877 |
8 | 4140 |
9 | 21147 |
10 | 115974 |
11 | 678530 |
12 | 4212654 |
13 | 27627153 |
14 | 190624976 |
15 | 1378972826 |
16 | 10425400681 |
17 | 82139435907 |
18 | 672674215928 |
19 | 5712423473216 |
20 | 50193986895328 |
21 | 455436027242590 |
22 | 4259359394306331 |
[1,1,2,5,15,52,203,877,4140,21147,115974,678530, 4212654,27627153,190624976,1378972826,10425400681, 82139435907,672674215928,5712423473216, 50193986895328,455436027242590,4259359394306331] |