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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 19 |
| 3 | 268 |
| 4 | 4477 |
| 5 | 82110 |
| 6 | 1597963 |
| 7 | 32402460 |
| 8 | 677152153 |
| 9 | 14481799261 |
| 10 | 315417278757 |
| 11 | 6972246638416 |
| 12 | 156017257712825 |
| 13 | 3527275634678216 |
| 14 | 80447862652931941 |
| 15 | 1848737311902300600 |
| 16 | 42766087499793329349 |
| 17 | 995043161703028219128 |
| 18 | 23271045049097437148389 |
[1,2,19,268,4477,82110,1597963,32402460,677152153, 14481799261,315417278757,6972246638416, 156017257712825,3527275634678216, 80447862652931941,1848737311902300600, 42766087499793329349,995043161703028219128, 23271045049097437148389] |