n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 18 |
4 | 70 |
5 | 246 |
6 | 924 |
7 | 3412 |
8 | 12870 |
9 | 48550 |
10 | 184756 |
11 | 705180 |
12 | 2704156 |
13 | 10399676 |
14 | 40116600 |
15 | 155114088 |
16 | 601080390 |
17 | 2333593350 |
18 | 9075135300 |
19 | 35345215180 |
20 | 137846528820 |
21 | 538257689684 |
22 | 2104098963720 |
23 | 8233430022168 |
24 | 32247603683100 |
[1,1,6,18,70,246,924,3412,12870,48550,184756, 705180,2704156,10399676,40116600,155114088, 601080390,2333593350,9075135300,35345215180, 137846528820,538257689684,2104098963720, 8233430022168,32247603683100] |