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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 6 |
| 3 | 0 |
| 4 | 28 |
| 5 | 0 |
| 6 | 120 |
| 7 | 0 |
| 8 | 496 |
| 9 | 0 |
| 10 | 2016 |
| 11 | 0 |
| 12 | 8128 |
| 13 | 0 |
| 14 | 32640 |
| 15 | 0 |
| 16 | 130816 |
| 17 | 0 |
| 18 | 523776 |
| 19 | 0 |
| 20 | 2096128 |
| 21 | 0 |
| 22 | 8386560 |
| 23 | 0 |
| 24 | 33550336 |
| 25 | 0 |
| 26 | 134209536 |
| 27 | 0 |
| 28 | 536854528 |
| 29 | 0 |
| 30 | 2147450880 |
| 31 | 0 |
| 32 | 8589869056 |
| 33 | 0 |
| 34 | 34359607296 |
| 35 | 0 |
| 36 | 137438691328 |
| 37 | 0 |
| 38 | 549755289600 |
| 39 | 0 |
| 40 | 2199022206976 |
| 41 | 0 |
[1,0,6,0,28,0,120,0,496,0,2016,0,8128,0,32640,0, 130816,0,523776,0,2096128,0,8386560,0,33550336,0, 134209536,0,536854528,0,2147450880,0,8589869056,0, 34359607296,0,137438691328,0,549755289600,0, 2199022206976,0] |