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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 114 |
| 5 | 1191 |
| 6 | 15993 |
| 7 | 263976 |
| 8 | 5189778 |
| 9 | 118729335 |
| 10 | 3104549229 |
| 11 | 91472523339 |
| 12 | 3002047651764 |
| 13 | 108699541743348 |
| 14 | 4307549574285900 |
| 15 | 185545521930558012 |
| 16 | 8636223446937857130 |
| 17 | 432133295481763698951 |
| 18 | 23140414627731672497973 |
| 19 | 1320835234697505382760757 |
| 20 | 80076275471464881277266666 |
| 21 | 5139849930933791535446756127 |
[1,3,15,114,1191,15993,263976,5189778,118729335, 3104549229,91472523339,3002047651764, 108699541743348,4307549574285900, 185545521930558012,8636223446937857130, 432133295481763698951,23140414627731672497973, 1320835234697505382760757, 80076275471464881277266666, 5139849930933791535446756127] |