n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 33 |
4 | 384 |
5 | 5705 |
6 | 103392 |
7 | 2213225 |
8 | 54648832 |
9 | 1529006769 |
10 | 47806489600 |
11 | 1651929898641 |
12 | 62514008358912 |
13 | 2571311967708601 |
14 | 114219516618117120 |
15 | 5449390043986849305 |
16 | 277913379747357786112 |
17 | 15087434965491213149153 |
18 | 868698417435317196816384 |
19 | 52875073161897308106963585 |
[1,1,4,33,384,5705,103392,2213225,54648832, 1529006769,47806489600,1651929898641, 62514008358912,2571311967708601, 114219516618117120,5449390043986849305, 277913379747357786112,15087434965491213149153, 868698417435317196816384, 52875073161897308106963585] |