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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 3 |
| 8 | 0 |
| 9 | 1 |
| 10 | 0 |
| 11 | 6 |
| 12 | 0 |
| 13 | 32 |
| 14 | 0 |
| 15 | 110 |
| 16 | 0 |
| 17 | 252 |
| 18 | 0 |
| 19 | 1139 |
| 20 | 0 |
| 21 | 3127 |
| 22 | 0 |
| 23 | 12743 |
| 24 | 0 |
| 25 | 39767 |
| 26 | 0 |
| 27 | 156376 |
| 28 | 0 |
| 29 | 517381 |
| 30 | 0 |
| 31 | 1870169 |
| 32 | 0 |
| 33 | 6786580 |
| 34 | 0 |
| 35 | 25420402 |
| 36 | 0 |
| 37 | 90815872 |
| 38 | 0 |
| 39 | 334621081 |
| 40 | 0 |
| 41 | 1235976769 |
| 42 | 0 |
| 43 | 4597232973 |
| 44 | 0 |
| 45 | 17047065235 |
| 46 | 0 |
| 47 | 63450750049 |
| 48 | 0 |
| 49 | 238163814619 |
| 50 | 0 |
[0,0,0,0,0,0,3,0,1,0,6,0,32,0,110,0,252,0,1139,0, 3127,0,12743,0,39767,0,156376,0,517381,0,1870169, 0,6786580,0,25420402,0,90815872,0,334621081,0, 1235976769,0,4597232973,0,17047065235,0, 63450750049,0,238163814619,0] |