The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 90 |
| 2 | 18 |
| 3 | 36 |
| 4 | 18 |
| 5 | 18 |
| 6 | 54 |
| 7 | 36 |
| 8 | 90 |
| 9 | 18 |
| 10 | 72 |
| 11 | 18 |
| 12 | 18 |
| 13 | 18 |
| 14 | 36 |
| 15 | 18 |
| 16 | 54 |
| 17 | 18 |
| 18 | 90 |
| 19 | 18 |
| 20 | 18 |
| 21 | 18 |
| 22 | 18 |
| 23 | 18 |
| 24 | 36 |
| 25 | 18 |
| 26 | 36 |
| 27 | 18 |
| 28 | 18 |
| 29 | 18 |
| 30 | 36 |
| 31 | 90 |
| 32 | 36 |
| 33 | 18 |
| 34 | 18 |
| 35 | 18 |
| 36 | 72 |
| 37 | 18 |
| 38 | 54 |
| 39 | 18 |
| 40 | 18 |
| 41 | 18 |
| 42 | 18 |
| 43 | 54 |
| 44 | 36 |
| 45 | 18 |
| 46 | 18 |
| 47 | 18 |
| 48 | 18 |
| 49 | 18 |
| 50 | 54 |
| 51 | 36 |
| 52 | 36 |
| 53 | 18 |
| 54 | 36 |
| 55 | 36 |
| 56 | 18 |
| 57 | 18 |
| 58 | 54 |
| 59 | 18 |
| 60 | 54 |
| 61 | 36 |
| 62 | 18 |
| 63 | 18 |
| 64 | 18 |
| 65 | 18 |
| 66 | 18 |
| 67 | 54 |
| 68 | 18 |
| 69 | 18 |
| 70 | 72 |
| 71 | 18 |
| 72 | 54 |
| 73 | 36 |
| 74 | 36 |
| 75 | 18 |
| 76 | 36 |
| 77 | 36 |
| 78 | 18 |
| 79 | 18 |
| 80 | 18 |
| 81 | 18 |
[90,18,36,18,18,54,36,90,18,72,18,18,18,36,18,54, 18,90,18,18,18,18,18,36,18,36,18,18,18,36,90,36, 18,18,18,72,18,54,18,18,18,18,54,36,18,18,18,18, 18,54,36,36,18,36,36,18,18,54,18,54,36,18,18,18, 18,18,54,18,18,72,18,54,36,36,18,36,36,18,18,18, 18] |