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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1020 |
| 6 | 2040 |
| 7 | 0 |
| 8 | 34782 |
| 9 | 41956 |
| 10 | 0 |
| 11 | 376992 |
| 12 | 362406 |
| 13 | 0 |
| 14 | 2306832 |
| 15 | 1933920 |
| 16 | 0 |
| 17 | 9891384 |
| 18 | 7591792 |
| 19 | 0 |
| 20 | 33439476 |
| 21 | 24124428 |
| 22 | 0 |
| 23 | 95442624 |
| 24 | 65640978 |
| 25 | 0 |
| 26 | 239451936 |
| 27 | 158815904 |
| 28 | 0 |
| 29 | 542842980 |
| 30 | 350243520 |
| 31 | 0 |
| 32 | 1135694622 |
| 33 | 715382916 |
| 34 | 0 |
| 35 | 2225152032 |
| 36 | 1373241708 |
| 37 | 0 |
| 38 | 4123291248 |
| 39 | 2505490464 |
| 40 | 0 |
| 41 | 7286817984 |
| 42 | 4367865216 |
| 43 | 0 |
| 44 | 12375237108 |
| 45 | 7321237204 |
| 46 | 0 |
| 47 | 20304913152 |
| 48 | 11884992774 |
| 49 | 0 |
| 50 | 32294964192 |
| 51 | 18736213536 |
[1,0,0,0,0,1020,2040,0,34782,41956,0,376992, 362406,0,2306832,1933920,0,9891384,7591792,0, 33439476,24124428,0,95442624,65640978,0,239451936, 158815904,0,542842980,350243520,0,1135694622, 715382916,0,2225152032,1373241708,0,4123291248, 2505490464,0,7286817984,4367865216,0,12375237108, 7321237204,0,20304913152,11884992774,0, 32294964192,18736213536] |