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 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 13 |
| 5 | 27 |
| 6 | 69 |
| 7 | 161 |
| 8 | 415 |
| 9 | 1033 |
| 10 | 2701 |
| 11 | 6983 |
| 12 | 18521 |
| 13 | 49041 |
| 14 | 131723 |
| 15 | 354493 |
| 16 | 962381 |
| 17 | 2620675 |
| 18 | 7178285 |
| 19 | 19724513 |
| 20 | 54430023 |
| 21 | 150641937 |
| 22 | 418294813 |
| 23 | 1164528399 |
| 24 | 3250685297 |
| 25 | 9094701729 |
| 26 | 25501672595 |
| 27 | 71649158709 |
| 28 | 201687341901 |