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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 55 |
| 3 | 1500 |
| 4 | 38097 |
| 5 | 957006 |
| 6 | 24009733 |
| 7 | 600923375 |
| 8 | 15029968375 |
| 9 | 376116199534 |
| 10 | 9394097589045 |
| 11 | 234816663728554 |
| 12 | 5869407851857410 |
| 13 | 146709570371173411 |
| 14 | 3667093829512515427 |
| 15 | 91661210468678400305 |
| 16 | 2291126428942263984999 |
| 17 | 57268064504720859650768 |
[1,1,55,1500,38097,957006,24009733,600923375, 15029968375,376116199534,9394097589045, 234816663728554,5869407851857410, 146709570371173411,3667093829512515427, 91661210468678400305,2291126428942263984999, 57268064504720859650768] |