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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 16 |
| 3 | 19 |
| 4 | 54 |
| 5 | 73 |
| 6 | 200 |
| 7 | 273 |
| 8 | 473 |
| 9 | 746 |
| 10 | 1965 |
| 11 | 6641 |
| 12 | 8606 |
| 13 | 170155 |
| 14 | 348916 |
| 15 | 1216903 |
| 16 | 1565819 |
| 17 | 2782722 |
| 18 | 12696707 |
| 19 | 117053085 |
| 20 | 129749792 |
| 21 | 1025301629 |
| 22 | 1155051421 |
| 23 | 4490455892 |
| 24 | 28097786773 |
| 25 | 60686029438 |
| 26 | 695644110591 |
| 27 | 756330140029 |
| 28 | 1451974250620 |
| 29 | 2208304390649 |
[1,3,16,19,54,73,200,273,473,746,1965,6641,8606, 170155,348916,1216903,1565819,2782722,12696707, 117053085,129749792,1025301629,1155051421, 4490455892,28097786773,60686029438,695644110591, 756330140029,1451974250620,2208304390649] |