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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 34 |
| 3 | 286 |
| 4 | 2840 |
| 5 | 32344 |
| 6 | 414160 |
| 7 | 5876336 |
| 8 | 91356544 |
| 9 | 1542401920 |
| 10 | 28075364096 |
| 11 | 547643910400 |
| 12 | 11389266525184 |
| 13 | 251428006132736 |
| 14 | 5869482147358720 |
| 15 | 144413021660821504 |
| 16 | 3733822274973040640 |
| 17 | 101181690628832198656 |
| 18 | 2867011297057247002624 |
| 19 | 84764595415605494743040 |
[1,5,34,286,2840,32344,414160,5876336,91356544, 1542401920,28075364096,547643910400, 11389266525184,251428006132736,5869482147358720, 144413021660821504,3733822274973040640, 101181690628832198656,2867011297057247002624, 84764595415605494743040] |