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 | 5 |
| 4 | 13 |
| 5 | 35 |
| 6 | 96 |
| 7 | 266 |
| 8 | 741 |
| 9 | 2070 |
| 10 | 5791 |
| 11 | 16213 |
| 12 | 45409 |
| 13 | 127206 |
| 14 | 356384 |
| 15 | 998509 |
| 16 | 2797678 |
| 17 | 7838801 |
| 18 | 21963661 |
| 19 | 61540563 |
| 20 | 172432468 |
| 21 | 483144522 |
| 22 | 1353740121 |
| 23 | 3793094450 |
| 24 | 10628012915 |
| 25 | 29779028189 |
| 26 | 83438979561 |
| 27 | 233790820762 |
| 28 | 655067316176 |
| 29 | 1835457822857 |
| 30 | 5142838522138 |
| 31 | 14409913303805 |