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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 0 |
| 6 | 1 |
| 7 | 4 |
| 8 | 8 |
| 9 | 0 |
| 10 | 1 |
| 11 | 6 |
| 12 | 20 |
| 13 | 44 |
| 14 | 0 |
| 15 | 1 |
| 16 | 8 |
| 17 | 36 |
| 18 | 120 |
| 19 | 280 |
| 20 | 0 |
| 21 | 1 |
| 22 | 10 |
| 23 | 56 |
| 24 | 236 |
| 25 | 800 |
| 26 | 1936 |
| 27 | 0 |
| 28 | 1 |
| 29 | 12 |
| 30 | 80 |
| 31 | 400 |
| 32 | 1656 |
| 33 | 5696 |
| 34 | 14128 |
| 35 | 0 |
| 36 | 1 |
| 37 | 14 |
| 38 | 108 |
| 39 | 620 |
| 40 | 2960 |
| 41 | 12192 |
| 42 | 42416 |
| 43 | 107088 |
| 44 | 0 |
| 45 | 1 |
| 46 | 16 |
| 47 | 140 |
| 48 | 904 |
| 49 | 4840 |
| 50 | 22592 |
| 51 | 92960 |
| 52 | 326304 |
| 53 | 834912 |
| 54 | 0 |
| 55 | 1 |
| 56 | 18 |
| 57 | 176 |
| 58 | 1260 |
| 59 | 7440 |
| 60 | 38352 |
| 61 | 176800 |
| 62 | 727824 |
| 63 | 2572992 |
| 64 | 6652608 |
| 65 | 0 |
[1,1,0,1,2,0,1,4,8,0,1,6,20,44,0,1,8,36,120,280,0, 1,10,56,236,800,1936,0,1,12,80,400,1656,5696, 14128,0,1,14,108,620,2960,12192,42416,107088,0,1, 16,140,904,4840,22592,92960,326304,834912,0,1,18, 176,1260,7440,38352,176800,727824,2572992,6652608, 0] |