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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 403 |
| 3 | 5080 |
| 4 | 61831 |
| 5 | 745108 |
| 6 | 8952763 |
| 7 | 107475760 |
| 8 | 1289869711 |
| 9 | 15479049388 |
| 10 | 185750955523 |
| 11 | 2229020652040 |
| 12 | 26748283770391 |
| 13 | 320979546636868 |
| 14 | 3851755118036683 |
| 15 | 46221063628493920 |
| 16 | 554652772325571871 |
| 17 | 6655833302847731548 |
| 18 | 79869999773355124243 |
| 19 | 958439997835247481400 |
| 20 | 11501279976237683562151 |
[1,28,403,5080,61831,745108,8952763,107475760, 1289869711,15479049388,185750955523,2229020652040, 26748283770391,320979546636868,3851755118036683, 46221063628493920,554652772325571871, 6655833302847731548,79869999773355124243, 958439997835247481400,11501279976237683562151] |