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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 9 |
| 6 | 42 |
| 7 | 43 |
| 8 | 84 |
| 9 | 85 |
| 10 | 2730 |
| 11 | 2731 |
| 12 | 5460 |
| 13 | 5461 |
| 14 | 21864 |
| 15 | 21865 |
| 16 | 59477 |
| 17 | 60073 |
| 18 | 66303 |
| 19 | 75048 |
| 20 | 112509 |
| 21 | 156607 |
| 22 | 174762 |
| 23 | 174763 |
| 24 | 283327 |
| 25 | 312190 |
| 26 | 320768 |
| 27 | 349524 |
| 28 | 349525 |
| 29 | 351570 |
| 30 | 354429 |
| 31 | 374589 |
| 32 | 384039 |
| 33 | 479037 |
| 34 | 504510 |
| 35 | 527103 |
| 36 | 624040 |
| 37 | 625470 |
| 38 | 656829 |
| 39 | 688830 |
| 40 | 711423 |