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 | 7 |
| 3 | 16 |
| 4 | 34 |
| 5 | 74 |
| 6 | 154 |
| 7 | 330 |
| 8 | 682 |
| 9 | 1451 |
| 10 | 2989 |
| 11 | 6332 |
| 12 | 13018 |
| 13 | 27495 |
| 14 | 56449 |
| 15 | 118954 |
| 16 | 243964 |
| 17 | 513180 |
| 18 | 1051612 |
| 19 | 2208856 |
| 20 | 4523344 |
| 21 | 9489604 |
| 22 | 19422124 |
| 23 | 40704746 |
| 24 | 83269990 |
| 25 | 174366100 |
| 26 | 356558320 |
| 27 | 746073604 |
| 28 | 1525104172 |
| 29 | 3189119418 |