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| n | a(n) |
|---|---|
| 1 | 48 |
| 2 | 120 |
| 3 | 774 |
| 4 | 4458 |
| 5 | 26644 |
| 6 | 157322 |
| 7 | 932576 |
| 8 | 5521380 |
| 9 | 32701386 |
| 10 | 193661452 |
| 11 | 1146912480 |
| 12 | 6792272698 |
| 13 | 40225408560 |
| 14 | 238224086698 |
| 15 | 1410817796536 |
| 16 | 8355186864526 |
| 17 | 49481335558724 |
| 18 | 293039831819072 |
| 19 | 1735449179468938 |
[48,120,774,4458,26644,157322,932576,5521380, 32701386,193661452,1146912480,6792272698, 40225408560,238224086698,1410817796536, 8355186864526,49481335558724,293039831819072, 1735449179468938] |