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 | 4 |
| 2 | 9 |
| 3 | 15 |
| 4 | 21 |
| 5 | 33 |
| 6 | 38 |
| 7 | 58 |
| 8 | 65 |
| 9 | 86 |
| 10 | 106 |
| 11 | 121 |
| 12 | 129 |
| 13 | 265 |
| 14 | 2049 |
| 15 | 3865 |
| 16 | 4163 |
| 17 | 8557 |
| 18 | 14005 |
| 19 | 80413 |
| 20 | 104757 |
| 21 | 116333 |
| 22 | 152713 |
| 23 | 241354 |
| 24 | 2273893 |
| 25 | 2492909 |
| 26 | 16432401 |
| 27 | 31701485 |
| 28 | 34090613 |
| 29 | 263504954 |
| 30 | 424792297 |
| 31 | 1534443805 |
| 32 | 3233454667 |
| 33 | 10580401481 |