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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 197 |
| 3 | 1386 |
| 4 | 39005 |
| 5 | 274421 |
| 6 | 7722793 |
| 7 | 54333972 |
| 8 | 1529074009 |
| 9 | 10757852035 |
| 10 | 302748930989 |
| 11 | 2130000368958 |
| 12 | 59942759261813 |
| 13 | 421729315201649 |
| 14 | 11868363584907985 |
| 15 | 83500274409557544 |
| 16 | 2349876047052519217 |
| 17 | 16532632603777192063 |
| 18 | 465263588952813896981 |
[1,7,197,1386,39005,274421,7722793,54333972, 1529074009,10757852035,302748930989,2130000368958, 59942759261813,421729315201649,11868363584907985, 83500274409557544,2349876047052519217, 16532632603777192063,465263588952813896981] |