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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 24 |
| 3 | 152 |
| 4 | 894 |
| 5 | 5748 |
| 6 | 38296 |
| 7 | 263484 |
| 8 | 1849602 |
| 9 | 13192840 |
| 10 | 95268876 |
| 11 | 694784964 |
| 12 | 5108061670 |
| 13 | 37808693148 |
| 14 | 281458023972 |
| 15 | 2105591552060 |
| 16 | 15819570917916 |
| 17 | 119302287092028 |
| 18 | 902712209530524 |
| 19 | 6850780687656012 |
| 20 | 52130155754678238 |
[6,24,152,894,5748,38296,263484,1849602,13192840, 95268876,694784964,5108061670,37808693148, 281458023972,2105591552060,15819570917916, 119302287092028,902712209530524,6850780687656012, 52130155754678238] |