n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 9 |
4 | 23 |
5 | 66 |
6 | 204 |
7 | 669 |
8 | 2305 |
9 | 8348 |
10 | 31542 |
11 | 124021 |
12 | 507937 |
13 | 2154494 |
14 | 9455972 |
15 | 42847307 |
16 | 200258387 |
17 | 962904904 |
18 | 4759773172 |
19 | 24142168317 |
20 | 125575232141 |
21 | 668689805690 |
22 | 3643481771390 |
23 | 20286338601133 |
[1,2,4,9,23,66,204,669,2305,8348,31542,124021, 507937,2154494,9455972,42847307,200258387, 962904904,4759773172,24142168317,125575232141, 668689805690,3643481771390,20286338601133] |