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| n | a(n) |
|---|---|
| 1 | 216 |
| 2 | 19188 |
| 3 | 1363572 |
| 4 | 87559668 |
| 5 | 5306911092 |
| 6 | 309846524148 |
| 7 | 17623065834612 |
| 8 | 983118947312628 |
| 9 | 54032675767734132 |
| 10 | 2934733632740325108 |
| 11 | 157871441490222209652 |
| 12 | 8425105813832255961588 |
| 13 | 446611038737537558861172 |
[216,19188,1363572,87559668,5306911092, 309846524148,17623065834612,983118947312628, 54032675767734132,2934733632740325108, 157871441490222209652,8425105813832255961588, 446611038737537558861172] |