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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 12 |
| 3 | 65 |
| 4 | 465 |
| 5 | 4212 |
| 6 | 46441 |
| 7 | 604389 |
| 8 | 9071250 |
| 9 | 154267865 |
| 10 | 2931801639 |
| 11 | 61578273462 |
| 12 | 1416474723373 |
| 13 | 35415138314415 |
| 14 | 956276678789100 |
| 15 | 27733572777976973 |
| 16 | 859779201497486829 |
| 17 | 28373745267763162716 |
| 18 | 993110842735800666085 |
| 19 | 36746019445535955976665 |
[1,3,12,65,465,4212,46441,604389,9071250, 154267865,2931801639,61578273462,1416474723373, 35415138314415,956276678789100,27733572777976973, 859779201497486829,28373745267763162716, 993110842735800666085,36746019445535955976665] |