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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 22 |
| 3 | 90 |
| 4 | 511 |
| 5 | 2373 |
| 6 | 12412 |
| 7 | 60420 |
| 8 | 307021 |
| 9 | 1520343 |
| 10 | 7646002 |
| 11 | 38097150 |
| 12 | 190884331 |
| 13 | 953225913 |
| 14 | 4769716792 |
| 15 | 23837822280 |
| 16 | 119221396441 |
| 17 | 596010127083 |
| 18 | 2980341200782 |
| 19 | 14900834307810 |
| 20 | 74506786627351 |
| 21 | 372526087871853 |
| 22 | 1862653975153972 |
| 23 | 9313199268385740 |
| 24 | 46566208164081061 |
[1,3,22,90,511,2373,12412,60420,307021,1520343, 7646002,38097150,190884331,953225913,4769716792, 23837822280,119221396441,596010127083, 2980341200782,14900834307810,74506786627351, 372526087871853,1862653975153972,9313199268385740, 46566208164081061] |