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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 108 |
| 3 | 2500 |
| 4 | 19208 |
| 5 | 292820 |
| 6 | 799708 |
| 7 | 4009008 |
| 8 | 7819260 |
| 9 | 24626008 |
| 10 | 99019340 |
| 11 | 147763360 |
| 12 | 427308708 |
| 13 | 791213080 |
| 14 | 1052990708 |
| 15 | 1795722608 |
| 16 | 3692745108 |
| 17 | 7028069380 |
| 18 | 8584421420 |
| 19 | 15073038508 |
| 20 | 21345812040 |
| 21 | 25217638008 |
| 22 | 40508084240 |
[8,108,2500,19208,292820,799708,4009008,7819260, 24626008,99019340,147763360,427308708,791213080, 1052990708,1795722608,3692745108,7028069380, 8584421420,15073038508,21345812040,25217638008, 40508084240] |