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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 23 |
| 3 | 150 |
| 4 | 765 |
| 5 | 5065 |
| 6 | 32337 |
| 7 | 223672 |
| 8 | 1556583 |
| 9 | 11178843 |
| 10 | 81228819 |
| 11 | 599868763 |
| 12 | 4475307567 |
| 13 | 33731219901 |
| 14 | 256268778463 |
| 15 | 1961208117130 |
| 16 | 15101975890677 |
| 17 | 116936866669157 |
| 18 | 909887821312929 |
| 19 | 7110983852617913 |
| 20 | 55793178281433653 |
[1,10,23,150,765,5065,32337,223672,1556583, 11178843,81228819,599868763,4475307567, 33731219901,256268778463,1961208117130, 15101975890677,116936866669157,909887821312929, 7110983852617913,55793178281433653] |