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| n | a(n) |
|---|---|
| 1 | 90 |
| 2 | 468 |
| 3 | 2982 |
| 4 | 22320 |
| 5 | 191106 |
| 6 | 1838220 |
| 7 | 19599822 |
| 8 | 229257288 |
| 9 | 2917290090 |
| 10 | 40107565764 |
| 11 | 592302134070 |
| 12 | 9349254600288 |
| 13 | 157059054215442 |
| 14 | 2797498002296700 |
| 15 | 52657059745734366 |
| 16 | 1044337677676754040 |
| 17 | 21765735199891598202 |
| 18 | 475573090189331643828 |
| 19 | 10870086948032475194310 |
[90,468,2982,22320,191106,1838220,19599822, 229257288,2917290090,40107565764,592302134070, 9349254600288,157059054215442,2797498002296700, 52657059745734366,1044337677676754040, 21765735199891598202,475573090189331643828, 10870086948032475194310] |