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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 165 |
| 3 | 247 |
| 4 | 954 |
| 5 | 13869 |
| 6 | 43604 |
| 7 | 228056 |
| 8 | 1976020 |
| 9 | 9093873 |
| 10 | 51610410 |
| 11 | 361362973 |
| 12 | 1985497197 |
| 13 | 11760202787 |
| 14 | 75909662200 |
| 15 | 448886626784 |
| 16 | 2721480635319 |
| 17 | 17080156724712 |
| 18 | 103985805258335 |
| 19 | 638132195692524 |
| 20 | 3970731506103798 |
[5,165,247,954,13869,43604,228056,1976020,9093873, 51610410,361362973,1985497197,11760202787, 75909662200,448886626784,2721480635319, 17080156724712,103985805258335,638132195692524, 3970731506103798] |