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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 22 |
| 3 | 282 |
| 4 | 5224 |
| 5 | 126120 |
| 6 | 3742704 |
| 7 | 131612432 |
| 8 | 5347866752 |
| 9 | 246490091136 |
| 10 | 12704900911360 |
| 11 | 724072211436288 |
| 12 | 45209213973292032 |
| 13 | 3068872654856532992 |
| 14 | 225023336997933996032 |
| 15 | 17724257054969009940480 |
| 16 | 1492513932494133333753856 |
| 17 | 133800772458366199028023296 |
[1,3,22,282,5224,126120,3742704,131612432, 5347866752,246490091136,12704900911360, 724072211436288,45209213973292032, 3068872654856532992,225023336997933996032, 17724257054969009940480,1492513932494133333753856, 133800772458366199028023296] |