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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 0 |
| 4 | 4 |
| 5 | 0 |
| 6 | 10 |
| 7 | 0 |
| 8 | 16 |
| 9 | 0 |
| 10 | 40 |
| 11 | 0 |
| 12 | 68 |
| 13 | 0 |
| 14 | 170 |
| 15 | 0 |
| 16 | 256 |
| 17 | 0 |
| 18 | 640 |
| 19 | 0 |
| 20 | 1088 |
| 21 | 0 |
| 22 | 2720 |
| 23 | 0 |
| 24 | 4112 |
| 25 | 0 |
| 26 | 10280 |
| 27 | 0 |
| 28 | 17476 |
| 29 | 0 |
| 30 | 43690 |
| 31 | 0 |
| 32 | 65536 |
| 33 | 0 |
| 34 | 163840 |
| 35 | 0 |
| 36 | 278528 |
| 37 | 0 |
| 38 | 696320 |
| 39 | 0 |
| 40 | 1052672 |
| 41 | 0 |
| 42 | 2631680 |
| 43 | 0 |
| 44 | 4473856 |
| 45 | 0 |
| 46 | 11184640 |
| 47 | 0 |
| 48 | 16777472 |
| 49 | 0 |
| 50 | 41943680 |
| 51 | 0 |
| 52 | 71304256 |
| 53 | 0 |
[1,0,2,0,4,0,10,0,16,0,40,0,68,0,170,0,256,0,640, 0,1088,0,2720,0,4112,0,10280,0,17476,0,43690,0, 65536,0,163840,0,278528,0,696320,0,1052672,0, 2631680,0,4473856,0,11184640,0,16777472,0, 41943680,0,71304256,0] |