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| n | a(n) |
|---|---|
| 1 | 148 |
| 2 | 756 |
| 3 | 3972 |
| 4 | 21432 |
| 5 | 115972 |
| 6 | 631628 |
| 7 | 3435216 |
| 8 | 18733728 |
| 9 | 102007004 |
| 10 | 556289404 |
| 11 | 3030290308 |
| 12 | 16522951748 |
| 13 | 90024199928 |
| 14 | 490800907380 |
| 15 | 2674421936852 |
| 16 | 14579265732508 |
| 17 | 79450066179340 |
| 18 | 433084651112312 |
| 19 | 2360226967287744 |
[148,756,3972,21432,115972,631628,3435216, 18733728,102007004,556289404,3030290308, 16522951748,90024199928,490800907380, 2674421936852,14579265732508,79450066179340, 433084651112312,2360226967287744] |