n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 5 |
3 | 15 |
4 | 195 |
5 | 663 |
6 | 4641 |
7 | 16575 |
8 | 480675 |
9 | 1762475 |
10 | 13042315 |
11 | 48612265 |
12 | 729183975 |
13 | 2748462675 |
14 | 20809788825 |
15 | 79077197535 |
16 | 4823709049635 |
17 | 18443593425075 |
18 | 141400882925575 |
19 | 543277076503525 |
20 | 8366466978154285 |
21 | 32270658344309385 |
[1,1,5,15,195,663,4641,16575,480675,1762475, 13042315,48612265,729183975,2748462675, 20809788825,79077197535,4823709049635, 18443593425075,141400882925575,543277076503525, 8366466978154285,32270658344309385] |