n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 21 |
4 | 91 |
5 | 266 |
6 | 994 |
7 | 2562 |
8 | 7764 |
9 | 19482 |
10 | 51212 |
11 | 116028 |
12 | 288541 |
13 | 612463 |
14 | 1375609 |
15 | 2862437 |
16 | 6036606 |
17 | 11846488 |
18 | 24080685 |
19 | 45506290 |
[1,6,21,91,266,994,2562,7764,19482,51212,116028, 288541,612463,1375609,2862437,6036606,11846488, 24080685,45506290] |