The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 0 |
| 5 | 0 |
| 6 | 6 |
| 7 | 0 |
| 8 | 2 |
| 9 | 0 |
| 10 | 12 |
| 11 | 0 |
| 12 | 0 |
| 13 | 42 |
| 14 | 24 |
| 15 | 20 |
| 16 | 0 |
| 17 | 2 |
| 18 | 48 |
| 19 | 420 |
| 20 | 120 |
| 21 | 30 |
| 22 | 0 |
| 23 | 0 |
| 24 | 306 |
| 25 | 2160 |
| 26 | 2420 |
| 27 | 360 |
| 28 | 42 |
| 29 | 0 |
| 30 | 2 |
| 31 | 600 |
| 32 | 17532 |
| 33 | 27600 |
| 34 | 9750 |
| 35 | 840 |
| 36 | 56 |
| 37 | 0 |
| 38 | 0 |
| 39 | 2442 |
| 40 | 115464 |
| 41 | 375260 |
| 42 | 191760 |
| 43 | 30702 |
| 44 | 1680 |
| 45 | 72 |
| 46 | 0 |
| 47 | 2 |
| 48 | 6048 |
| 49 | 830100 |
| 50 | 4810680 |
| 51 | 4098510 |
| 52 | 917280 |
| 53 | 81032 |
| 54 | 3024 |
| 55 | 90 |
| 56 | 0 |
| 57 | 0 |
| 58 | 20706 |
| 59 | 5745120 |
| 60 | 62813540 |
| 61 | 85691640 |
| 62 | 28669662 |
| 63 | 3406368 |
| 64 | 187560 |
| 65 | 5040 |
| 66 | 110 |
[0,0,2,0,0,6,0,2,0,12,0,0,42,24,20,0,2,48,420,120, 30,0,0,306,2160,2420,360,42,0,2,600,17532,27600, 9750,840,56,0,0,2442,115464,375260,191760,30702, 1680,72,0,2,6048,830100,4810680,4098510,917280, 81032,3024,90,0,0,20706,5745120,62813540,85691640, 28669662,3406368,187560,5040,110] |