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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 0 |
| 5 | 0 |
| 6 | 6 |
| 7 | 0 |
| 8 | 0 |
| 9 | 2 |
| 10 | 22 |
| 11 | 0 |
| 12 | 0 |
| 13 | 10 |
| 14 | 19 |
| 15 | 91 |
| 16 | 0 |
| 17 | 0 |
| 18 | 60 |
| 19 | 114 |
| 20 | 138 |
| 21 | 408 |
| 22 | 0 |
| 23 | 0 |
| 24 | 420 |
| 25 | 798 |
| 26 | 966 |
| 27 | 918 |
| 28 | 1938 |
| 29 | 0 |
| 30 | 0 |
| 31 | 3360 |
| 32 | 6384 |
| 33 | 7728 |
| 34 | 7344 |
| 35 | 5890 |
| 36 | 9614 |
| 37 | 0 |
| 38 | 0 |
| 39 | 30240 |
| 40 | 57456 |
| 41 | 69552 |
| 42 | 66096 |
| 43 | 53010 |
| 44 | 37191 |
| 45 | 49335 |
| 46 | 0 |
| 47 | 0 |
| 48 | 302400 |
| 49 | 574560 |
| 50 | 695520 |
| 51 | 660960 |
| 52 | 530100 |
| 53 | 371910 |
| 54 | 233220 |
[1,0,2,0,0,6,0,0,2,22,0,0,10,19,91,0,0,60,114,138, 408,0,0,420,798,966,918,1938,0,0,3360,6384,7728, 7344,5890,9614,0,0,30240,57456,69552,66096,53010, 37191,49335,0,0,302400,574560,695520,660960, 530100,371910,233220] |