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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 70 |
| 2 | 905 |
| 3 | 6666 |
| 4 | 37580 |
| 5 | 181074 |
| 6 | 786715 |
| 7 | 3176210 |
| 8 | 12139859 |
| 9 | 44471340 |
| 10 | 157483176 |
| 11 | 542468100 |
| 12 | 1826073525 |
| 13 | 6028577566 |
| 14 | 19573942365 |
| 15 | 62643859374 |
| 16 | 197971385860 |
| 17 | 618724626390 |
| 18 | 1914707164559 |
| 19 | 5873145245930 |
[1,70,905,6666,37580,181074,786715,3176210, 12139859,44471340,157483176,542468100,1826073525, 6028577566,19573942365,62643859374,197971385860, 618724626390,1914707164559,5873145245930] |