n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 9 |
4 | 44 |
5 | 230 |
6 | 1236 |
7 | 6790 |
8 | 37832 |
9 | 213057 |
10 | 1209660 |
11 | 6912367 |
12 | 39705516 |
13 | 229055918 |
14 | 1326168018 |
15 | 7701734250 |
16 | 44846271632 |
17 | 261735599172 |
18 | 1530650010312 |
19 | 8967361033572 |
20 | 52619233554120 |
21 | 309203221308702 |
22 | 1819290987055630 |
23 | 10716835948503349 |
24 | 63196331969007264 |
[0,1,2,9,44,230,1236,6790,37832,213057,1209660, 6912367,39705516,229055918,1326168018,7701734250, 44846271632,261735599172,1530650010312, 8967361033572,52619233554120,309203221308702, 1819290987055630,10716835948503349, 63196331969007264] |