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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 4 |
| 2 | 27 |
| 3 | 31 |
| 4 | 213 |
| 5 | 244 |
| 6 | 1677 |
| 7 | 1921 |
| 8 | 13203 |
| 9 | 15124 |
| 10 | 103947 |
| 11 | 119071 |
| 12 | 818373 |
| 13 | 937444 |
| 14 | 6443037 |
| 15 | 7380481 |
| 16 | 50725923 |
| 17 | 58106404 |
| 18 | 399364347 |
| 19 | 457470751 |
| 20 | 3144188853 |
| 21 | 3601659604 |
| 22 | 24754146477 |
| 23 | 28355806081 |
[3,4,27,31,213,244,1677,1921,13203,15124,103947, 119071,818373,937444,6443037,7380481,50725923, 58106404,399364347,457470751,3144188853, 3601659604,24754146477,28355806081] |