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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 65 |
| 3 | 1145 |
| 4 | 23185 |
| 5 | 509005 |
| 6 | 11782465 |
| 7 | 283138545 |
| 8 | 6996125985 |
| 9 | 176633573205 |
| 10 | 4536739406465 |
| 11 | 118166489152745 |
| 12 | 3113854691067185 |
| 13 | 82864654201672605 |
| 14 | 2223776891616904065 |
| 15 | 60113561634017675745 |
| 16 | 1635364503704652830785 |
| 17 | 44739382956328846263205 |
| 18 | 1230059816693141938275265 |
[1,5,65,1145,23185,509005,11782465,283138545, 6996125985,176633573205,4536739406465, 118166489152745,3113854691067185, 82864654201672605,2223776891616904065, 60113561634017675745,1635364503704652830785, 44739382956328846263205,1230059816693141938275265] |