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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 74 |
| 4 | 672 |
| 5 | 6116 |
| 6 | 55648 |
| 7 | 506344 |
| 8 | 4607232 |
| 9 | 41921296 |
| 10 | 381442688 |
| 11 | 3470754464 |
| 12 | 31580462592 |
| 13 | 287351245376 |
| 14 | 2614614588928 |
| 15 | 23790429165184 |
| 16 | 216469579210752 |
| 17 | 1969660925337856 |
| 18 | 17921983194810368 |
| 19 | 163072474811861504 |
| 20 | 1483799630442995712 |
| 21 | 13501121791662580736 |
[0,1,8,74,672,6116,55648,506344,4607232,41921296, 381442688,3470754464,31580462592,287351245376, 2614614588928,23790429165184,216469579210752, 1969660925337856,17921983194810368, 163072474811861504,1483799630442995712, 13501121791662580736] |