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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 16 |
| 6 | 32 |
| 7 | 64 |
| 8 | 140 |
| 9 | 288 |
| 10 | 600 |
| 11 | 1264 |
| 12 | 2632 |
| 13 | 5504 |
| 14 | 11520 |
| 15 | 24064 |
| 16 | 50320 |
| 17 | 105216 |
| 18 | 219936 |
| 19 | 459840 |
| 20 | 961376 |
| 21 | 2009856 |
| 22 | 4201984 |
| 23 | 8784896 |
| 24 | 18366144 |
| 25 | 38397440 |
| 26 | 80275840 |
| 27 | 167829248 |
| 28 | 350873728 |
| 29 | 733556736 |
| 30 | 1533616128 |
| 31 | 3206266880 |
| 32 | 6703206656 |
| 33 | 14014111744 |
[1,0,2,4,6,16,32,64,140,288,600,1264,2632,5504, 11520,24064,50320,105216,219936,459840,961376, 2009856,4201984,8784896,18366144,38397440, 80275840,167829248,350873728,733556736,1533616128, 3206266880,6703206656,14014111744] |