n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 20 |
4 | 84 |
5 | 319 |
6 | 1260 |
7 | 4901 |
8 | 19176 |
9 | 74860 |
10 | 292494 |
11 | 1142459 |
12 | 4462920 |
13 | 17433181 |
14 | 68099226 |
15 | 266014100 |
16 | 1039126224 |
17 | 4059116419 |
18 | 15856045380 |
19 | 61938144041 |
20 | 241947712356 |
21 | 945115407340 |
22 | 3691885043874 |
23 | 14421535219799 |
24 | 56334548849040 |
25 | 220058498917081 |
[0,1,6,20,84,319,1260,4901,19176,74860,292494, 1142459,4462920,17433181,68099226,266014100, 1039126224,4059116419,15856045380,61938144041, 241947712356,945115407340,3691885043874, 14421535219799,56334548849040,220058498917081] |