n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 15 |
4 | 66 |
5 | 406 |
6 | 2775 |
7 | 19900 |
8 | 152076 |
9 | 1206681 |
10 | 9841266 |
11 | 82336528 |
12 | 702993756 |
13 | 6105180250 |
14 | 53822344278 |
15 | 480681790786 |
16 | 4342078862605 |
17 | 39621836138886 |
18 | 364831810979041 |
19 | 3386667673687950 |
20 | 31669036266203766 |
[1,3,15,66,406,2775,19900,152076,1206681,9841266, 82336528,702993756,6105180250,53822344278, 480681790786,4342078862605,39621836138886, 364831810979041,3386667673687950, 31669036266203766] |