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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | 0 |
| 18 | 0 |
| 19 | 0 |
| 20 | 0 |
| 21 | 0 |
| 22 | 0 |
| 23 | 0 |
| 24 | 0 |
| 25 | 0 |
| 26 | 0 |
| 27 | 0 |
| 28 | 0 |
| 29 | 0 |
| 30 | 0 |
| 31 | 0 |
| 32 | 0 |
| 33 | 0 |
| 34 | 0 |
| 35 | 3 |
| 36 | 21 |
| 37 | 125 |
| 38 | 466 |
| 39 | 1690 |
| 40 | 5424 |
| 41 | 16605 |
| 42 | 48092 |
| 43 | 135005 |
| 44 | 366357 |
| 45 | 971914 |
| 46 | 2521474 |
| 47 | 6428447 |
| 48 | 16123316 |
| 49 | 39882981 |
| 50 | 97384678 |
| 51 | 235064871 |
| 52 | 561279879 |
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,3,21,125,466,1690,5424,16605, 48092,135005,366357,971914,2521474,6428447, 16123316,39882981,97384678,235064871,561279879] |