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A171189 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 40 |
| 3 | 176 |
| 4 | 752 |
| 5 | 3168 |
| 6 | 13200 |
| 7 | 54592 |
| 8 | 224624 |
| 9 | 920672 |
| 10 | 3762240 |
| 11 | 15337408 |
| 12 | 62404656 |
| 13 | 253505184 |
| 14 | 1028426432 |
| 15 | 4167385088 |
| 16 | 16870487440 |
| 17 | 68237238816 |
| 18 | 275798010400 |
| 19 | 1113973454464 |
| 20 | 4496809953248 |
| 21 | 18142920856576 |
| 22 | 73165420555648 |
[1,8,40,176,752,3168,13200,54592,224624,920672, 3762240,15337408,62404656,253505184,1028426432, 4167385088,16870487440,68237238816,275798010400, 1113973454464,4496809953248,18142920856576, 73165420555648] |