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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 162 |
| 3 | 2903 |
| 4 | 60304 |
| 5 | 1331471 |
| 6 | 26724386 |
| 7 | 517476726 |
| 8 | 10025433990 |
| 9 | 191191601644 |
| 10 | 3592564336954 |
| 11 | 66997045991457 |
| 12 | 1240581415395934 |
| 13 | 22812879393607545 |
| 14 | 417195888212408920 |
| 15 | 7594010221332762302 |
| 16 | 137646990170206088748 |
[15,162,2903,60304,1331471,26724386,517476726, 10025433990,191191601644,3592564336954, 66997045991457,1240581415395934,22812879393607545, 417195888212408920,7594010221332762302, 137646990170206088748] |