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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 120 |
| 5 | 1556 |
| 6 | 27974 |
| 7 | 618824 |
| 8 | 16223180 |
| 9 | 490127050 |
| 10 | 16761331644 |
| 11 | 639969571892 |
| 12 | 26985326408240 |
| 13 | 1245476099801252 |
| 14 | 62451726395242858 |
| 15 | 3380720087847928728 |
| 16 | 196504354827002278248 |
| 17 | 12206388156005725243280 |
| 18 | 806977883623811932432386 |
| 19 | 56573396893818112613554940 |
| 20 | 4192088709829783508863131872 |
[1,3,14,120,1556,27974,618824,16223180,490127050, 16761331644,639969571892,26985326408240, 1245476099801252,62451726395242858, 3380720087847928728,196504354827002278248, 12206388156005725243280,806977883623811932432386, 56573396893818112613554940, 4192088709829783508863131872] |