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 | 2 |
| 2 | 4 |
| 3 | 11 |
| 4 | 27 |
| 5 | 61 |
| 6 | 140 |
| 7 | 327 |
| 8 | 762 |
| 9 | 1770 |
| 10 | 4113 |
| 11 | 9563 |
| 12 | 22233 |
| 13 | 51684 |
| 14 | 120149 |
| 15 | 279314 |
| 16 | 649328 |
| 17 | 1509503 |
| 18 | 3509167 |
| 19 | 8157825 |
| 20 | 18964644 |
| 21 | 44087447 |
| 22 | 102490878 |
| 23 | 238262386 |
| 24 | 553892849 |
| 25 | 1287644651 |
| 26 | 2993410641 |
| 27 | 6958835472 |
| 28 | 16177329785 |
| 29 | 37607729050 |