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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 47 |
| 4 | 778 |
| 5 | 25476 |
| 6 | 1752936 |
| 7 | 242632397 |
| 8 | 70015221566 |
| 9 | 41446777283255 |
| 10 | 49999934258165654 |
| 11 | 125272856707074638221 |
| 12 | 641938223803783115191706 |
| 13 | 6731818441446626626586172740 |
| 14 | 146378489075644780343627471981694 |
| 15 | 6505906463580477520696075719916583118 |
[1,1,6,47,778,25476,1752936,242632397,70015221566, 41446777283255,49999934258165654, 125272856707074638221,641938223803783115191706, 6731818441446626626586172740, 146378489075644780343627471981694, 6505906463580477520696075719916583118] |