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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 215 |
| 3 | 4564 |
| 4 | 106442 |
| 5 | 2635704 |
| 6 | 68031147 |
| 7 | 1810302340 |
| 8 | 49308457334 |
| 9 | 1368019979976 |
| 10 | 38525145673126 |
| 11 | 1098380420669000 |
| 12 | 31641932951483220 |
| 13 | 919622628946689648 |
| 14 | 26931762975278938035 |
| 15 | 793967020231145502564 |
| 16 | 23543663463050594677310 |
| 17 | 701763102761640853890600 |
| 18 | 21014048069544552257072530 |
| 19 | 631868353403527700756671320 |
| 20 | 19070677448561228207945931276 |
[1,12,215,4564,106442,2635704,68031147,1810302340, 49308457334,1368019979976,38525145673126, 1098380420669000,31641932951483220, 919622628946689648,26931762975278938035, 793967020231145502564,23543663463050594677310, 701763102761640853890600, 21014048069544552257072530, 631868353403527700756671320, 19070677448561228207945931276] |