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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 44 |
| 2 | 404 |
| 3 | 3644 |
| 4 | 32804 |
| 5 | 295244 |
| 6 | 2657204 |
| 7 | 23914844 |
| 8 | 215233604 |
| 9 | 1937102444 |
| 10 | 17433922004 |
| 11 | 156905298044 |
| 12 | 1412147682404 |
| 13 | 12709329141644 |
| 14 | 114383962274804 |
| 15 | 1029455660473244 |
| 16 | 9265100944259204 |
| 17 | 83385908498332844 |
| 18 | 750473176484995604 |
[4,44,404,3644,32804,295244,2657204,23914844, 215233604,1937102444,17433922004,156905298044, 1412147682404,12709329141644,114383962274804, 1029455660473244,9265100944259204, 83385908498332844,750473176484995604] |