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 | 9 |
| 3 | 29 |
| 4 | 101 |
| 5 | 247 |
| 6 | 2531 |
| 7 | 16033 |
| 8 | 26615 |
| 9 | 39359 |
| 10 | 104677 |
| 11 | 248426 |
| 12 | 506531 |
| 13 | 584237 |
| 14 | 2560202 |
| 15 | 4036993 |
| 16 | 4417843 |
| 17 | 5167619 |
| 18 | 9725141 |
| 19 | 25045807 |
| 20 | 27489719 |
| 21 | 70416301 |
| 22 | 111555415 |
| 23 | 174266734 |
| 24 | 359589619 |
| 25 | 1075714987 |
| 26 | 6820213399 |
| 27 | 15378035231 |
| 28 | 16598109538 |
| 29 | 19423306117 |
| 30 | 30133946758 |
| 31 | 74466436127 |