n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 48 |
4 | 275 |
5 | 1638 |
6 | 9996 |
7 | 62016 |
8 | 389367 |
9 | 2466750 |
10 | 15737865 |
11 | 100975680 |
12 | 650872404 |
13 | 4211628008 |
14 | 27341497800 |
15 | 177996090624 |
16 | 1161588834303 |
17 | 7596549816030 |
18 | 49772989810635 |
19 | 326658445806000 |
20 | 2147042307851595 |
21 | 14130873926790390 |
22 | 93115841412899760 |
[1,2,9,48,275,1638,9996,62016,389367,2466750, 15737865,100975680,650872404,4211628008, 27341497800,177996090624,1161588834303, 7596549816030,49772989810635,326658445806000, 2147042307851595,14130873926790390, 93115841412899760] |