n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 23 |
5 | 102 |
6 | 492 |
7 | 2498 |
8 | 13130 |
9 | 70800 |
10 | 389446 |
11 | 2176802 |
12 | 12328552 |
13 | 70597568 |
14 | 408061604 |
15 | 2377643974 |
16 | 13950607135 |
17 | 82355028006 |
18 | 488797440712 |
19 | 2915087969496 |
20 | 17459865132260 |
21 | 104981190319396 |
22 | 633438776314456 |
[1,2,6,23,102,492,2498,13130,70800,389446,2176802, 12328552,70597568,408061604,2377643974, 13950607135,82355028006,488797440712, 2915087969496,17459865132260,104981190319396, 633438776314456] |