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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 20 |
| 2 | 256 |
| 3 | 4832 |
| 4 | 42496 |
| 5 | 1467392 |
| 6 | 62836736 |
| 7 | 42790912 |
| 8 | 2535587840 |
| 9 | 170851041280 |
| 10 | 3070050172928 |
| 11 | 256460544016384 |
| 12 | 4697678227177472 |
| 13 | 52001663422038016 |
| 14 | 5598478396465086464 |
| 15 | 647670579588837146624 |
| 16 | 2427980359983876276224 |
| 17 | 9138219784535816536064 |
| 18 | 1277040945143933271277568 |
[2,20,256,4832,42496,1467392,62836736,42790912, 2535587840,170851041280,3070050172928, 256460544016384,4697678227177472, 52001663422038016,5598478396465086464, 647670579588837146624,2427980359983876276224, 9138219784535816536064,1277040945143933271277568] |