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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 86 |
| 5 | 894 |
| 6 | 14715 |
| 7 | 313364 |
| 8 | 8139398 |
| 9 | 245237925 |
| 10 | 8382002270 |
| 11 | 319994166042 |
| 12 | 13492740284184 |
| 13 | 622738642693202 |
| 14 | 31225868370080949 |
| 15 | 1690360086869176780 |
| 16 | 98252177808632109236 |
| 17 | 6103194081506193327048 |
| 18 | 403488941845715112039425 |
| 19 | 28286698447226523233226110 |
| 20 | 2096044354918091666701275248 |
[1,3,12,86,894,14715,313364,8139398,245237925, 8382002270,319994166042,13492740284184, 622738642693202,31225868370080949, 1690360086869176780,98252177808632109236, 6103194081506193327048,403488941845715112039425, 28286698447226523233226110, 2096044354918091666701275248] |