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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 15 |
| 4 | 186 |
| 5 | 2330 |
| 6 | 31065 |
| 7 | 447405 |
| 8 | 6979588 |
| 9 | 117745668 |
| 10 | 2141106795 |
| 11 | 41810587775 |
| 12 | 873474855726 |
| 13 | 19451904450654 |
| 14 | 460209050303821 |
| 15 | 11531197020389025 |
| 16 | 305122289460210120 |
| 17 | 8503747639606509128 |
| 18 | 249020038061419770783 |
| 19 | 7645072502094118876755 |
| 20 | 245564189847880300238290 |
[0,1,15,186,2330,31065,447405,6979588,117745668, 2141106795,41810587775,873474855726, 19451904450654,460209050303821,11531197020389025, 305122289460210120,8503747639606509128, 249020038061419770783,7645072502094118876755, 245564189847880300238290] |