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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 165 |
| 2 | 9075 |
| 3 | 259545 |
| 4 | 4723719 |
| 5 | 61408347 |
| 6 | 614083470 |
| 7 | 4971151900 |
| 8 | 33803832920 |
| 9 | 198520691512 |
| 10 | 1028698128744 |
| 11 | 4783805983320 |
| 12 | 20239179160200 |
| 13 | 78777112731240 |
| 14 | 284722993157196 |
| 15 | 963033653325810 |
| 16 | 3068489581675375 |
| 17 | 9262468551496875 |
| 18 | 26617409626933125 |
[1,165,9075,259545,4723719,61408347,614083470, 4971151900,33803832920,198520691512,1028698128744, 4783805983320,20239179160200,78777112731240, 284722993157196,963033653325810,3068489581675375, 9262468551496875,26617409626933125] |