n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 30 |
4 | 205 |
5 | 1750 |
6 | 17766 |
7 | 207942 |
8 | 2746815 |
9 | 40315858 |
10 | 649688072 |
11 | 11387466948 |
12 | 215440517656 |
13 | 4371810051908 |
14 | 94649397546302 |
15 | 2176321870192342 |
16 | 52938365091640943 |
17 | 1357592080006964806 |
18 | 36593629200726397630 |
19 | 1033979281229140895582 |
20 | 30552322294916306960625 |
[1,2,6,30,205,1750,17766,207942,2746815,40315858, 649688072,11387466948,215440517656,4371810051908, 94649397546302,2176321870192342,52938365091640943, 1357592080006964806,36593629200726397630, 1033979281229140895582,30552322294916306960625] |