n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 9 |
4 | 40 |
5 | 315 |
6 | 1896 |
7 | 21651 |
8 | 191360 |
9 | 2546487 |
10 | 28064080 |
11 | 488517183 |
12 | 5879603280 |
13 | 124673371719 |
14 | 1928346159572 |
15 | 42684093159480 |
16 | 754925802649360 |
17 | 20289814995554811 |
18 | 366300418631427144 |
19 | 11352374441063693655 |
20 | 250187625076714423520 |
21 | 7774760839170720287739 |
[1,2,9,40,315,1896,21651,191360,2546487,28064080, 488517183,5879603280,124673371719,1928346159572, 42684093159480,754925802649360,20289814995554811, 366300418631427144,11352374441063693655, 250187625076714423520,7774760839170720287739] |