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| n | a(n) |
|---|---|
| -1 | 0 |
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 60 |
| 4 | 499 |
| 5 | 5705 |
| 6 | 82207 |
| 7 | 1419768 |
| 8 | 28501125 |
| 9 | 651233671 |
| 10 | 16676686707 |
| 11 | 472883844004 |
| 12 | 14705395791319 |
| 13 | 497538872883741 |
| 14 | 18193397941038751 |
| 15 | 714950006521386992 |
| 16 | 30046260016074301961 |
| 17 | 1344648068888240941035 |
[0,1,3,11,60,499,5705,82207,1419768,28501125, 651233671,16676686707,472883844004,14705395791319, 497538872883741,18193397941038751, 714950006521386992,30046260016074301961, 1344648068888240941035] |