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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 61 |
| 4 | 766 |
| 5 | 10746 |
| 6 | 161376 |
| 7 | 2537781 |
| 8 | 41260086 |
| 9 | 687927166 |
| 10 | 11698135396 |
| 11 | 202104763026 |
| 12 | 3537486504556 |
| 13 | 62595852983236 |
| 14 | 1117926476207316 |
| 15 | 20124876291104421 |
| 16 | 364797768048805926 |
| 17 | 6652740911381353206 |
[1,1,6,61,766,10746,161376,2537781,41260086, 687927166,11698135396,202104763026,3537486504556, 62595852983236,1117926476207316,20124876291104421, 364797768048805926,6652740911381353206] |