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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 8 |
| 4 | 44202 |
| 5 | 13311268 |
| 6 | 4557702762 |
| 7 | 1495135512514 |
| 8 | 491857035772330 |
| 9 | 161514101568508400 |
| 10 | 53034853662012222798 |
| 11 | 17414154188157170439208 |
| 12 | 5717847862749642677204182 |
| 13 | 1877435447920358266870897874 |
| 14 | 616447390029326136628439042672 |
| 15 | 202407848349722353779265745190616 |
| 16 | 66459727085467788423206394162537418 |
| 17 | 21821760546806761707309514948565417796 |
| 18 | 7165079447164571822068029945303172129766 |
| 19 | 2352622444655438705806553391345493395131580 |
| 20 | 772473271844923268504474277422663237674924998 |
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