| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 45 |
| 3 | 182 |
| 4 | 946 |
| 5 | 5256 |
| 6 | 26592 |
| 7 | 139705 |
| 8 | 743357 |
| 9 | 3895564 |
| 10 | 20551990 |
| 11 | 108462086 |
| 12 | 571420486 |
| 13 | 3013738375 |
| 14 | 15893704443 |
| 15 | 83803905400 |
| 16 | 441952817246 |
| 17 | 2330642013397 |
| 18 | 12290475240990 |
| 19 | 64814511670451 |
| 20 | 341801050087962 |
| 21 | 1802496248933719 |
[2,45,182,946,5256,26592,139705,743357,3895564, 20551990,108462086,571420486,3013738375, 15893704443,83803905400,441952817246, 2330642013397,12290475240990,64814511670451, 341801050087962,1802496248933719] |