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| n | a(n) |
|---|---|
| 1 | 72 |
| 2 | 152 |
| 3 | 688 |
| 4 | 3530 |
| 5 | 17476 |
| 6 | 96752 |
| 7 | 508444 |
| 8 | 2779754 |
| 9 | 15042466 |
| 10 | 82159256 |
| 11 | 444621704 |
| 12 | 2428664182 |
| 13 | 13191373094 |
| 14 | 71979788054 |
| 15 | 391657232734 |
| 16 | 2135828584330 |
| 17 | 11631457626872 |
| 18 | 63409396318828 |
| 19 | 345453565197234 |
| 20 | 1882975612847854 |
[72,152,688,3530,17476,96752,508444,2779754, 15042466,82159256,444621704,2428664182, 13191373094,71979788054,391657232734, 2135828584330,11631457626872,63409396318828, 345453565197234,1882975612847854] |