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) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 21 |
| 4 | 25 |
| 5 | 63 |
| 6 | 67 |
| 7 | 129 |
| 8 | 133 |
| 9 | 219 |
| 10 | 199 |
| 11 | 333 |
| 12 | 337 |
| 13 | 471 |
| 14 | 475 |
| 15 | 633 |
| 16 | 637 |
| 17 | 819 |
| 18 | 823 |
| 19 | 1029 |
| 20 | 1009 |
| 21 | 1263 |
| 22 | 1267 |
| 23 | 1521 |
| 24 | 1525 |
| 25 | 1803 |
| 26 | 1807 |
| 27 | 2109 |
| 28 | 2113 |
| 29 | 2439 |
| 30 | 2419 |
| 31 | 2793 |
| 32 | 2797 |
| 33 | 3171 |
| 34 | 3175 |
| 35 | 3573 |
| 36 | 3577 |
| 37 | 3999 |
| 38 | 4003 |
| 39 | 4449 |
| 40 | 4429 |
| 41 | 4923 |
| 42 | 4927 |
| 43 | 5421 |
| 44 | 5425 |
| 45 | 5943 |
| 46 | 5947 |
| 47 | 6489 |