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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 30 |
| 3 | 492 |
| 4 | 9620 |
| 5 | 222630 |
| 6 | 5989242 |
| 7 | 184139480 |
| 8 | 6377545512 |
| 9 | 245868202890 |
| 10 | 10446648201110 |
| 11 | 485126443539012 |
| 12 | 24449173476952380 |
| 13 | 1329144227959100462 |
| 14 | 77535552689576436210 |
| 15 | 4831278674685354629040 |
| 16 | 320262424087652686405712 |
[0,2,30,492,9620,222630,5989242,184139480, 6377545512,245868202890,10446648201110, 485126443539012,24449173476952380, 1329144227959100462,77535552689576436210, 4831278674685354629040,320262424087652686405712] |