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| n | a(n) |
|---|---|
| 1 | 19 |
| 2 | 104 |
| 3 | 561 |
| 4 | 3050 |
| 5 | 16581 |
| 6 | 90185 |
| 7 | 490546 |
| 8 | 2668339 |
| 9 | 14514611 |
| 10 | 78953456 |
| 11 | 429474355 |
| 12 | 2336164665 |
| 13 | 12707780398 |
| 14 | 69125130363 |
| 15 | 376012453567 |
| 16 | 2045354053808 |
| 17 | 11125890031367 |
| 18 | 60520294171669 |
| 19 | 329205663240430 |
| 20 | 1790744248612871 |
[19,104,561,3050,16581,90185,490546,2668339, 14514611,78953456,429474355,2336164665, 12707780398,69125130363,376012453567, 2045354053808,11125890031367,60520294171669, 329205663240430,1790744248612871] |