n | a(n) |
---|---|
1 | 1 |
2 | 7 |
3 | 28 |
4 | 105 |
5 | 357 |
6 | 1197 |
7 | 3857 |
8 | 12300 |
9 | 38430 |
10 | 118874 |
11 | 362670 |
12 | 1095430 |
13 | 3271751 |
14 | 9673993 |
15 | 28310881 |
16 | 82033609 |
17 | 235359901 |
18 | 668779076 |
19 | 1882412994 |
20 | 5249817573 |
21 | 14510628853 |
[1,7,28,105,357,1197,3857,12300,38430,118874, 362670,1095430,3271751,9673993,28310881,82033609, 235359901,668779076,1882412994,5249817573, 14510628853] |