n | a(n) |
---|---|
1 | 2 |
2 | 19 |
3 | 80 |
4 | 262 |
5 | 1461 |
6 | 5443 |
7 | 24490 |
8 | 117962 |
9 | 459193 |
10 | 2147788 |
11 | 9481211 |
12 | 39404594 |
13 | 181740410 |
14 | 780110007 |
15 | 3374455576 |
16 | 15188622683 |
17 | 65126163196 |
18 | 286616870440 |
19 | 1266986470030 |
20 | 5476212217332 |
21 | 24183642014347 |
22 | 105926526183355 |
[2,19,80,262,1461,5443,24490,117962,459193, 2147788,9481211,39404594,181740410,780110007, 3374455576,15188622683,65126163196,286616870440, 1266986470030,5476212217332,24183642014347, 105926526183355] |