| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 16 |
| 3 | 28 |
| 4 | 112 |
| 5 | 448 |
| 6 | 784 |
| 7 | 3136 |
| 8 | 12301 |
| 9 | 19684 |
| 10 | 78736 |
| 11 | 314944 |
| 12 | 551152 |
| 13 | 2204608 |
| 14 | 8818432 |
| 15 | 15432256 |
| 16 | 61729024 |
| 17 | 242132884 |
| 18 | 387459856 |
[1,4,16,28,112,448,784,3136,12301,19684,78736, 314944,551152,2204608,8818432,15432256,61729024, 242132884,387459856] |