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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 38 |
| 3 | 466 |
| 4 | 5826 |
| 5 | 76258 |
| 6 | 1032442 |
| 7 | 14316582 |
| 8 | 202116106 |
| 9 | 2893451650 |
| 10 | 41886157562 |
| 11 | 611902123282 |
| 12 | 9007199254738 |
| 13 | 133439988963010 |
| 14 | 1987795697598010 |
| 15 | 29752813022112178 |
| 16 | 447193795726343002 |
| 17 | 6746237832670921766 |
| 18 | 102105221251235572186 |
[0,2,38,466,5826,76258,1032442,14316582,202116106, 2893451650,41886157562,611902123282,9007199254738, 133439988963010,1987795697598010, 29752813022112178,447193795726343002, 6746237832670921766,102105221251235572186] |