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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 33 |
| 3 | 142 |
| 4 | 895 |
| 5 | 4314 |
| 6 | 22921 |
| 7 | 113486 |
| 8 | 577071 |
| 9 | 2877562 |
| 10 | 14455993 |
| 11 | 72225582 |
| 12 | 361607935 |
| 13 | 1807659674 |
| 14 | 9041669481 |
| 15 | 45205690126 |
| 16 | 226052092111 |
| 17 | 1130241870522 |
| 18 | 5651375017753 |
| 19 | 28256745002222 |
| 20 | 141284885366175 |
| 21 | 706423516399834 |
[2,33,142,895,4314,22921,113486,577071,2877562, 14455993,72225582,361607935,1807659674,9041669481, 45205690126,226052092111,1130241870522, 5651375017753,28256745002222,141284885366175, 706423516399834] |