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 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 20 |
| 6 | 26 |
| 7 | 36 |
| 8 | 50 |
| 9 | 60 |
| 10 | 114 |
| 11 | 135 |
| 12 | 138 |
| 13 | 248 |
| 14 | 315 |
| 15 | 351 |
| 16 | 429 |
| 17 | 642 |
| 18 | 5505 |
| 19 | 8793 |
| 20 | 12086 |
| 21 | 13580 |
| 22 | 23109 |
| 23 | 34626 |
| 24 | 34706 |
| 25 | 56282 |
| 26 | 57675 |
| 27 | 58298 |