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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 3 |
| 4 | 6 |
| 5 | 4 |
| 6 | 1 |
| 7 | 0 |
| 8 | 9 |
| 9 | 54 |
| 10 | 120 |
| 11 | 135 |
| 12 | 84 |
| 13 | 28 |
| 14 | 4 |
| 15 | 0 |
| 16 | 22 |
| 17 | 294 |
| 18 | 1360 |
| 19 | 3250 |
| 20 | 4662 |
| 21 | 4284 |
| 22 | 2568 |
| 23 | 981 |
| 24 | 219 |
| 25 | 22 |
| 26 | 0 |
| 27 | 51 |
| 28 | 1260 |
| 29 | 10120 |
| 30 | 41405 |
| 31 | 103020 |
| 32 | 170324 |
| 33 | 196172 |
| 34 | 160965 |
| 35 | 94390 |
| 36 | 38896 |
| 37 | 10764 |
| 38 | 1807 |
| 39 | 140 |
| 40 | 0 |
| 41 | 108 |
| 42 | 4590 |
| 43 | 58380 |
| 44 | 368145 |
| 45 | 1404102 |
| 46 | 3587696 |
| 47 | 6515712 |
| 48 | 8715465 |
| 49 | 8763645 |
| 50 | 6684744 |
| 51 | 3863496 |
| 52 | 1670942 |
| 53 | 525980 |
| 54 | 114240 |
| 55 | 15368 |
| 56 | 969 |
[1,1,0,3,6,4,1,0,9,54,120,135,84,28,4,0,22,294, 1360,3250,4662,4284,2568,981,219,22,0,51,1260, 10120,41405,103020,170324,196172,160965,94390, 38896,10764,1807,140,0,108,4590,58380,368145, 1404102,3587696,6515712,8715465,8763645,6684744, 3863496,1670942,525980,114240,15368,969] |