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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 42 |
| 3 | 340 |
| 4 | 3135 |
| 5 | 32466 |
| 6 | 373156 |
| 7 | 4713192 |
| 8 | 64877805 |
| 9 | 966466270 |
| 10 | 15487707246 |
| 11 | 265617899196 |
| 12 | 4853435351947 |
| 13 | 94114052406570 |
| 14 | 1930026941433480 |
| 15 | 41728495237790416 |
| 16 | 948549349736725401 |
| 17 | 22613209058160908982 |
| 18 | 564104540143144909810 |
| 19 | 14694713818659640322340 |
[1,6,42,340,3135,32466,373156,4713192,64877805, 966466270,15487707246,265617899196,4853435351947, 94114052406570,1930026941433480,41728495237790416, 948549349736725401,22613209058160908982, 564104540143144909810,14694713818659640322340] |