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 | 11 |
| 4 | 21 |
| 5 | 51 |
| 6 | 93 |
| 7 | 207 |
| 8 | 517 |
| 9 | 1007 |
| 10 | 2333 |
| 11 | 5847 |
| 12 | 11781 |
| 13 | 27055 |
| 14 | 66861 |
| 15 | 137895 |
| 16 | 314197 |
| 17 | 766367 |
| 18 | 1610429 |
| 19 | 3649239 |
| 20 | 8799333 |
| 21 | 18772687 |
| 22 | 42381645 |
| 23 | 101181063 |
| 24 | 218513269 |
| 25 | 492148223 |
| 26 | 1164905693 |
| 27 | 2540589879 |
| 28 | 5713965957 |
| 29 | 13425837103 |
| 30 | 29512490349 |