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 | 31 |
| 2 | 91 |
| 3 | 269 |
| 4 | 797 |
| 5 | 2365 |
| 6 | 7025 |
| 7 | 20883 |
| 8 | 62115 |
| 9 | 184845 |
| 10 | 550289 |
| 11 | 1638775 |
| 12 | 4881719 |
| 13 | 14545715 |
| 14 | 43350415 |
| 15 | 129222077 |
| 16 | 385262397 |
| 17 | 1148802957 |
| 18 | 3426077313 |
| 19 | 10218944199 |
| 20 | 30483682935 |
| 21 | 90944672583 |
| 22 | 271351287651 |
| 23 | 809707376697 |