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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 73 |
| 4 | 1364 |
| 5 | 34586 |
| 6 | 1110496 |
| 7 | 43207004 |
| 8 | 1976199792 |
| 9 | 103925934712 |
| 10 | 6178846168976 |
| 11 | 409847155094840 |
| 12 | 30007066358487040 |
| 13 | 2403751529017358144 |
| 14 | 209131503815967330816 |
| 15 | 19637892118783264231936 |
| 16 | 1979605910448187576510208 |
| 17 | 213226210180592877512104832 |
[1,1,6,73,1364,34586,1110496,43207004,1976199792, 103925934712,6178846168976,409847155094840, 30007066358487040,2403751529017358144, 209131503815967330816,19637892118783264231936, 1979605910448187576510208, 213226210180592877512104832] |