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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 1 |
| 6 | 9 |
| 7 | 9 |
| 8 | 5 |
| 9 | 1 |
| 10 | 27 |
| 11 | 27 |
| 12 | 19 |
| 13 | 7 |
| 14 | 1 |
| 15 | 81 |
| 16 | 81 |
| 17 | 65 |
| 18 | 33 |
| 19 | 9 |
| 20 | 1 |
| 21 | 243 |
| 22 | 243 |
| 23 | 211 |
| 24 | 131 |
| 25 | 51 |
| 26 | 11 |
| 27 | 1 |
| 28 | 729 |
| 29 | 729 |
| 30 | 665 |
| 31 | 473 |
| 32 | 233 |
| 33 | 73 |
| 34 | 13 |
| 35 | 1 |
| 36 | 2187 |
| 37 | 2187 |
| 38 | 2059 |
| 39 | 1611 |
| 40 | 939 |
| 41 | 379 |
| 42 | 99 |
| 43 | 15 |
| 44 | 1 |
| 45 | 6561 |
| 46 | 6561 |
| 47 | 6305 |
| 48 | 5281 |
| 49 | 3489 |
| 50 | 1697 |
| 51 | 577 |
| 52 | 129 |
| 53 | 17 |
| 54 | 1 |
| 55 | 19683 |
| 56 | 19683 |
| 57 | 19171 |