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| n | a(n) |
|---|---|
| 0 | 5 |
| 1 | 36 |
| 2 | 262 |
| 3 | 1920 |
| 4 | 14132 |
| 5 | 104304 |
| 6 | 771160 |
| 7 | 5707584 |
| 8 | 42271568 |
| 9 | 313200960 |
| 10 | 2321178208 |
| 11 | 17205305856 |
| 12 | 127543611200 |
| 13 | 945542935296 |
| 14 | 7010032442752 |
| 15 | 51971929512960 |
| 16 | 385322051101952 |
| 17 | 2856819009782784 |
| 18 | 21180878379927040 |
[5,36,262,1920,14132,104304,771160,5707584, 42271568,313200960,2321178208,17205305856, 127543611200,945542935296,7010032442752, 51971929512960,385322051101952,2856819009782784, 21180878379927040] |