The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 0 |
| 6 | 3 |
| 7 | 6 |
| 8 | 6 |
| 9 | 3 |
| 10 | 0 |
| 11 | 3 |
| 12 | 9 |
| 13 | 6 |
| 14 | 3 |
| 15 | 0 |
| 16 | 15 |
| 17 | 15 |
| 18 | 30 |
| 19 | 45 |
| 20 | 15 |
| 21 | 0 |
| 22 | 15 |
| 23 | 30 |
| 24 | 30 |
| 25 | 15 |
| 26 | 15 |
| 27 | 30 |
| 28 | 45 |
| 29 | 30 |
| 30 | 30 |
| 31 | 30 |
| 32 | 30 |
| 33 | 30 |
| 34 | 30 |
| 35 | 45 |
| 36 | 30 |
| 37 | 15 |
| 38 | 15 |
| 39 | 30 |
| 40 | 30 |
| 41 | 15 |
| 42 | 0 |
| 43 | 15 |
| 44 | 45 |
| 45 | 30 |
| 46 | 15 |
| 47 | 15 |
| 48 | 45 |
| 49 | 45 |
| 50 | 45 |
| 51 | 45 |
| 52 | 45 |
| 53 | 30 |
| 54 | 30 |
| 55 | 30 |
| 56 | 45 |
| 57 | 30 |
| 58 | 15 |
| 59 | 15 |
| 60 | 45 |
| 61 | 30 |
| 62 | 15 |
| 63 | 0 |
| 64 | 63 |
| 65 | 75 |
| 66 | 138 |
| 67 | 201 |
| 68 | 75 |
| 69 | 63 |
| 70 | 126 |
| 71 | 189 |
| 72 | 138 |
| 73 | 126 |
[0,0,0,0,3,0,3,6,6,3,0,3,9,6,3,0,15,15,30,45,15,0, 15,30,30,15,15,30,45,30,30,30,30,30,30,45,30,15, 15,30,30,15,0,15,45,30,15,15,45,45,45,45,45,30,30, 30,45,30,15,15,45,30,15,0,63,75,138,201,75,63,126, 189,138,126] |