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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 14 |
| 4 | 92 |
| 5 | 844 |
| 6 | 9304 |
| 7 | 121288 |
| 8 | 1822736 |
| 9 | 31030928 |
| 10 | 590248736 |
| 11 | 12406395616 |
| 12 | 285558273472 |
| 13 | 7143371664064 |
| 14 | 192972180052352 |
| 15 | 5598713198048384 |
| 16 | 173627942889668864 |
| 17 | 5731684010612723968 |
| 18 | 200669613102747214336 |
| 19 | 7426773564495661485568 |
| 20 | 289713958515451427511296 |
[1,2,14,92,844,9304,121288,1822736,31030928, 590248736,12406395616,285558273472,7143371664064, 192972180052352,5598713198048384, 173627942889668864,5731684010612723968, 200669613102747214336,7426773564495661485568, 289713958515451427511296] |