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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 73 |
| 3 | 148 |
| 4 | 5401 |
| 5 | 10950 |
| 6 | 399601 |
| 7 | 810152 |
| 8 | 29565073 |
| 9 | 59940298 |
| 10 | 2187415801 |
| 11 | 4434771900 |
| 12 | 161839204201 |
| 13 | 328113180302 |
| 14 | 11973913695073 |
| 15 | 24275940570448 |
| 16 | 885907774231201 |
| 17 | 1796091489032850 |
| 18 | 65545201379413801 |
| 19 | 132886494247860452 |
| 20 | 4849458994302390073 |
[1,2,73,148,5401,10950,399601,810152,29565073, 59940298,2187415801,4434771900,161839204201, 328113180302,11973913695073,24275940570448, 885907774231201,1796091489032850, 65545201379413801,132886494247860452, 4849458994302390073] |