This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 0 |
| 6 | 8 |
| 7 | 9 |
| 8 | 3 |
| 9 | 0 |
| 10 | 18 |
| 11 | 27 |
| 12 | 12 |
| 13 | 3 |
| 14 | 0 |
| 15 | 48 |
| 16 | 81 |
| 17 | 54 |
| 18 | 18 |
| 19 | 3 |
| 20 | 0 |
| 21 | 116 |
| 22 | 243 |
| 23 | 198 |
| 24 | 89 |
| 25 | 21 |
| 26 | 3 |
| 27 | 0 |
| 28 | 312 |
| 29 | 729 |
| 30 | 729 |
| 31 | 405 |
| 32 | 135 |
| 33 | 27 |
| 34 | 3 |
| 35 | 0 |
| 36 | 810 |
| 37 | 2187 |
| 38 | 2538 |
| 39 | 1701 |
| 40 | 702 |
| 41 | 189 |
| 42 | 30 |
| 43 | 3 |
| 44 | 0 |
| 45 | 2184 |
| 46 | 6561 |
| 47 | 8748 |
| 48 | 6801 |
| 49 | 3402 |
| 50 | 1134 |
| 51 | 251 |
| 52 | 36 |
| 53 | 3 |
| 54 | 0 |
| 55 | 5880 |
| 56 | 19683 |
| 57 | 29484 |
| 58 | 26244 |
| 59 | 15282 |
| 60 | 6123 |
| 61 | 1692 |