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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 7 |
| 2 | 58 |
| 3 | 505 |
| 4 | 4650 |
| 5 | 44677 |
| 6 | 443238 |
| 7 | 4507461 |
| 8 | 46744100 |
| 9 | 492492330 |
| 10 | 5257084420 |
| 11 | 56734340091 |
| 12 | 618001356458 |
| 13 | 6785943435960 |
| 14 | 75033214770640 |
| 15 | 834733624099485 |
| 16 | 9336542892778440 |
| 17 | 104932793226255165 |
| 18 | 1184421713336050590 |
| 19 | 13421053387405062290 |
| 20 | 152613573227667516580 |
[0,7,58,505,4650,44677,443238,4507461,46744100, 492492330,5257084420,56734340091,618001356458, 6785943435960,75033214770640,834733624099485, 9336542892778440,104932793226255165, 1184421713336050590,13421053387405062290, 152613573227667516580] |