n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 63 |
6 | 238 |
7 | 921 |
8 | 3724 |
9 | 15481 |
10 | 65567 |
11 | 282538 |
12 | 1236274 |
13 | 5472661 |
14 | 24462349 |
15 | 110348896 |
16 | 501604455 |
17 | 2294792044 |
18 | 10560615629 |
19 | 48858061607 |
20 | 227074658274 |
21 | 1059724267133 |
22 | 4964418948999 |
23 | 23335624138336 |
24 | 110026811495899 |
25 | 520243459277072 |
26 | 2466277600473485 |
27 | 11719307714768490 |
28 | 55809636116165236 |
[1,1,2,6,18,63,238,921,3724,15481,65567,282538, 1236274,5472661,24462349,110348896,501604455, 2294792044,10560615629,48858061607,227074658274, 1059724267133,4964418948999,23335624138336, 110026811495899,520243459277072,2466277600473485, 11719307714768490,55809636116165236] |