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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 35 |
| 4 | 196 |
| 5 | 1041 |
| 6 | 5778 |
| 7 | 29928 |
| 8 | 165372 |
| 9 | 847768 |
| 10 | 4670704 |
| 11 | 23822408 |
| 12 | 130996724 |
| 13 | 666301327 |
| 14 | 3659417070 |
| 15 | 18584154238 |
| 16 | 101986105620 |
| 17 | 517452054522 |
| 18 | 2838222123890 |
| 19 | 14392322734127 |
| 20 | 78915504085490 |
| 21 | 400031746789975 |
| 22 | 2192959234558576 |
[1,6,35,196,1041,5778,29928,165372,847768,4670704, 23822408,130996724,666301327,3659417070, 18584154238,101986105620,517452054522, 2838222123890,14392322734127,78915504085490, 400031746789975,2192959234558576] |