n | a(n) |
---|---|
3 | 3 |
4 | 31 |
5 | 252 |
6 | 1776 |
7 | 11048 |
8 | 61106 |
9 | 303664 |
10 | 1368844 |
11 | 5651241 |
12 | 21559133 |
13 | 76613440 |
14 | 255411923 |
15 | 803771681 |
16 | 2400633464 |
17 | 6837010458 |
18 | 18644075466 |
19 | 48855805143 |
20 | 123415815229 |
21 | 301386128354 |
22 | 713271875603 |
23 | 1639572164669 |
24 | 3667859207856 |
[3,31,252,1776,11048,61106,303664,1368844,5651241, 21559133,76613440,255411923,803771681,2400633464, 6837010458,18644075466,48855805143,123415815229, 301386128354,713271875603,1639572164669, 3667859207856] |