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| n | a(n) |
|---|---|
| 1 | 8736 |
| 2 | 21048 |
| 3 | 45792 |
| 4 | 127032 |
| 5 | 319488 |
| 6 | 972888 |
| 7 | 2723040 |
| 8 | 8836536 |
| 9 | 26699136 |
| 10 | 90688728 |
| 11 | 289595232 |
| 12 | 1018007352 |
| 13 | 3387971328 |
| 14 | 12231257688 |
| 15 | 42028017120 |
| 16 | 154964007096 |
| 17 | 546131550336 |
| 18 | 2047907680728 |
| 19 | 7365720907872 |
| 20 | 27996112930872 |
| 21 | 102364560941568 |
[8736,21048,45792,127032,319488,972888,2723040, 8836536,26699136,90688728,289595232,1018007352, 3387971328,12231257688,42028017120,154964007096, 546131550336,2047907680728,7365720907872, 27996112930872,102364560941568] |