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 | 3 |
| 2 | 11 |
| 3 | 37 |
| 4 | 153 |
| 5 | 551 |
| 6 | 2023 |
| 7 | 7701 |
| 8 | 29417 |
| 9 | 107083 |
| 10 | 384771 |
| 11 | 1408133 |
| 12 | 5457961 |
| 13 | 22466367 |
| 14 | 92977823 |
| 15 | 365613181 |
| 16 | 1342359393 |
| 17 | 4677908531 |
| 18 | 16159185307 |
| 19 | 58676063493 |
| 20 | 231520762361 |
| 21 | 967464685783 |
| 22 | 4052593703511 |
| 23 | 16354948948517 |
| 24 | 62709285045913 |
| 25 | 229276436653851 |