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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 | 3 |
| 31 | 9 |
| 32 | 31 |
| 33 | 80 |
| 34 | 208 |
| 35 | 487 |
| 36 | 1138 |
| 37 | 2536 |
| 38 | 5656 |
| 39 | 12379 |
| 40 | 27214 |
| 41 | 59741 |
| 42 | 132372 |
| 43 | 295310 |
| 44 | 666257 |
| 45 | 1516495 |
| 46 | 3483520 |
| 47 | 8053923 |
| 48 | 18713380 |
| 49 | 43587681 |
| 50 | 101600012 |
| 51 | 236551985 |
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,3,9,31,80,208,487,1138,2536,5656,12379, 27214,59741,132372,295310,666257,1516495,3483520, 8053923,18713380,43587681,101600012,236551985] |