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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 324 |
| 3 | 2038 |
| 4 | 24344 |
| 5 | 221096 |
| 6 | 2171944 |
| 7 | 19965136 |
| 8 | 184319130 |
| 9 | 1664588696 |
| 10 | 14941791994 |
| 11 | 132720725536 |
| 12 | 1171588072850 |
| 13 | 10275058180372 |
| 14 | 89663150159240 |
| 15 | 778803031279908 |
| 16 | 6737980364090108 |
| 17 | 58088493991210808 |
| 18 | 499217935061929964 |
[0,324,2038,24344,221096,2171944,19965136, 184319130,1664588696,14941791994,132720725536, 1171588072850,10275058180372,89663150159240, 778803031279908,6737980364090108, 58088493991210808,499217935061929964] |