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| n | a(n) |
|---|---|
| 0 | 8 |
| 1 | 56 |
| 2 | 488 |
| 3 | 4376 |
| 4 | 39368 |
| 5 | 354296 |
| 6 | 3188648 |
| 7 | 28697816 |
| 8 | 258280328 |
| 9 | 2324522936 |
| 10 | 20920706408 |
| 11 | 188286357656 |
| 12 | 1694577218888 |
| 13 | 15251194969976 |
| 14 | 137260754729768 |
| 15 | 1235346792567896 |
| 16 | 11118121133111048 |
| 17 | 100063090197999416 |
| 18 | 900567811781994728 |
| 19 | 8105110306037952536 |
[8,56,488,4376,39368,354296,3188648,28697816, 258280328,2324522936,20920706408,188286357656, 1694577218888,15251194969976,137260754729768, 1235346792567896,11118121133111048, 100063090197999416,900567811781994728, 8105110306037952536] |