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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 40 |
| 3 | 176 |
| 4 | 736 |
| 5 | 3008 |
| 6 | 12160 |
| 7 | 48896 |
| 8 | 196096 |
| 9 | 785408 |
| 10 | 3143680 |
| 11 | 12578816 |
| 12 | 50323456 |
| 13 | 201310208 |
| 14 | 805273600 |
| 15 | 3221159936 |
| 16 | 12884770816 |
| 17 | 51539345408 |
| 18 | 206157905920 |
| 19 | 824632672256 |
| 20 | 3298532786176 |
| 21 | 13194135339008 |
| 22 | 52776549744640 |
[1,8,40,176,736,3008,12160,48896,196096,785408, 3143680,12578816,50323456,201310208,805273600, 3221159936,12884770816,51539345408,206157905920, 824632672256,3298532786176,13194135339008, 52776549744640] |