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) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 29 |
| 3 | 173 |
| 4 | 1037 |
| 5 | 6221 |
| 6 | 37325 |
| 7 | 223949 |
| 8 | 1343693 |
| 9 | 8062157 |
| 10 | 48372941 |
| 11 | 290237645 |
| 12 | 1741425869 |
| 13 | 10448555213 |
| 14 | 62691331277 |
| 15 | 376147987661 |
| 16 | 2256887925965 |
| 17 | 13541327555789 |
| 18 | 81247965334733 |
| 19 | 487487792008397 |
| 20 | 2924926752050381 |