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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 80 |
| 4 | 158 |
| 5 | 9428 |
| 6 | 21740 |
| 7 | 1814144 |
| 8 | 4326566 |
| 9 | 480716188 |
| 10 | 1138919436 |
| 11 | 162673628256 |
| 12 | 377710551084 |
| 13 | 67537379669352 |
| 14 | 153236971128120 |
| 15 | 33578612305618176 |
| 16 | 74565718435602822 |
| 17 | 19669491236331371820 |
| 18 | 42886189370197775372 |
| 19 | 13410838610779209885664 |
[1,2,2,80,158,9428,21740,1814144,4326566, 480716188,1138919436,162673628256,377710551084, 67537379669352,153236971128120,33578612305618176, 74565718435602822,19669491236331371820, 42886189370197775372,13410838610779209885664] |