n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 11 |
5 | 32 |
6 | 117 |
7 | 467 |
8 | 2135 |
9 | 10480 |
10 | 55091 |
11 | 301633 |
12 | 1704115 |
13 | 9819216 |
14 | 57365191 |
15 | 338134521 |
16 | 2005134639 |
17 | 11937364184 |
18 | 71254895955 |
19 | 426063226937 |
20 | 2550552314219 |
21 | 15280103807200 |
22 | 91588104196415 |
23 | 549159428968825 |
[1,1,2,4,11,32,117,467,2135,10480,55091,301633, 1704115,9819216,57365191,338134521,2005134639, 11937364184,71254895955,426063226937, 2550552314219,15280103807200,91588104196415, 549159428968825] |