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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | 5 |
| 6 | 0 |
| 7 | 16 |
| 8 | 28 |
| 9 | 61 |
| 10 | 0 |
| 11 | 272 |
| 12 | 440 |
| 13 | 662 |
| 14 | 1385 |
| 15 | 0 |
| 16 | 7936 |
| 17 | 12448 |
| 18 | 17176 |
| 19 | 24568 |
| 20 | 50521 |
| 21 | 0 |
| 22 | 353792 |
| 23 | 546560 |
| 24 | 727232 |
| 25 | 949520 |
| 26 | 1326122 |
| 27 | 2702765 |
| 28 | 0 |
| 29 | 22368256 |
| 30 | 34259968 |
| 31 | 44720896 |
| 32 | 56140288 |
| 33 | 71350336 |
| 34 | 98329108 |
| 35 | 199360981 |
| 36 | 0 |
| 37 | 1903757312 |
| 38 | 2900372480 |
| 39 | 3742967552 |
| 40 | 4600173440 |
| 41 | 5610570992 |
| 42 | 7020926600 |
| 43 | 9596075582 |
| 44 | 19391512145 |
| 45 | 0 |
| 46 | 209865342976 |
| 47 | 318605529088 |
| 48 | 408133590016 |
| 49 | 495154244608 |
| 50 | 590470281856 |
| 51 | 708137588128 |
| 52 | 877465887496 |
| 53 | 1192744081648 |
| 54 | 2404879675441 |
[1,0,1,0,2,5,0,16,28,61,0,272,440,662,1385,0,7936, 12448,17176,24568,50521,0,353792,546560,727232, 949520,1326122,2702765,0,22368256,34259968, 44720896,56140288,71350336,98329108,199360981,0, 1903757312,2900372480,3742967552,4600173440, 5610570992,7020926600,9596075582,19391512145,0, 209865342976,318605529088,408133590016, 495154244608,590470281856,708137588128, 877465887496,1192744081648,2404879675441] |