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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 200 |
| 4 | 643 |
| 5 | 2422 |
| 6 | 9430 |
| 7 | 38207 |
| 8 | 156792 |
| 9 | 649758 |
| 10 | 2703377 |
| 11 | 11276024 |
| 12 | 47088326 |
| 13 | 196773391 |
| 14 | 822559178 |
| 15 | 3439147214 |
| 16 | 14380613647 |
| 17 | 60135069834 |
| 18 | 251472698220 |
| 19 | 1051624711847 |
| 20 | 4397789612658 |
| 21 | 18391203655144 |
| 22 | 76910735347923 |
[8,64,200,643,2422,9430,38207,156792,649758, 2703377,11276024,47088326,196773391,822559178, 3439147214,14380613647,60135069834,251472698220, 1051624711847,4397789612658,18391203655144, 76910735347923] |