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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 178 |
| 4 | 2300 |
| 5 | 32380 |
| 6 | 481932 |
| 7 | 7458370 |
| 8 | 118809868 |
| 9 | 1935217180 |
| 10 | 32083715344 |
| 11 | 539615356884 |
| 12 | 9184652815816 |
| 13 | 157908543871712 |
| 14 | 2738272978314500 |
| 15 | 47837620415491554 |
| 16 | 841151610003847564 |
| 17 | 14874918252400486060 |
| 18 | 264381545177102073600 |
| 19 | 4720297172922980155740 |
[1,2,16,178,2300,32380,481932,7458370,118809868, 1935217180,32083715344,539615356884,9184652815816, 157908543871712,2738272978314500, 47837620415491554,841151610003847564, 14874918252400486060,264381545177102073600, 4720297172922980155740] |