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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 209430786243 |
| 3 | 3907821040411155686 |
| 4 | 614057559169335453819010 |
| 5 | 6767073673905716055915469215 |
| 6 | 13749422954239269326919955861621 |
| 7 | 8665930063459510313925842272832668 |
[0,1,209430786243,3907821040411155686, 614057559169335453819010, 6767073673905716055915469215, 13749422954239269326919955861621, 8665930063459510313925842272832668] |