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| n | a(n) |
|---|---|
| 1 | 19 |
| 2 | 171 |
| 3 | 2280 |
| 4 | 32490 |
| 5 | 495216 |
| 6 | 7839780 |
| 7 | 127695960 |
| 8 | 2122929090 |
| 9 | 35854187880 |
| 10 | 613106378136 |
| 11 | 10590023536200 |
| 12 | 184442905990860 |
| 13 | 3234844881712080 |
| 14 | 57071906063500860 |
| 15 | 1012075135324821024 |
| 16 | 18027588346914850290 |
| 17 | 322375697516753069760 |
| 18 | 5784852794310472599780 |
| 19 | 104127350297911241532840 |
[19,171,2280,32490,495216,7839780,127695960, 2122929090,35854187880,613106378136, 10590023536200,184442905990860,3234844881712080, 57071906063500860,1012075135324821024, 18027588346914850290,322375697516753069760, 5784852794310472599780,104127350297911241532840] |