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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 51 |
| 3 | 301 |
| 4 | 1934 |
| 5 | 12150 |
| 6 | 78028 |
| 7 | 503290 |
| 8 | 3300161 |
| 9 | 21613114 |
| 10 | 142211597 |
| 11 | 935498770 |
| 12 | 6162356043 |
| 13 | 40586946972 |
| 14 | 267431775698 |
| 15 | 1762039513414 |
| 16 | 11611113184810 |
| 17 | 76511018946858 |
| 18 | 504186073584110 |
| 19 | 3322423043189704 |
| 20 | 21893946278661421 |
[12,51,301,1934,12150,78028,503290,3300161, 21613114,142211597,935498770,6162356043, 40586946972,267431775698,1762039513414, 11611113184810,76511018946858,504186073584110, 3322423043189704,21893946278661421] |