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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 7 |
| 6 | 14 |
| 7 | 29 |
| 8 | 64 |
| 9 | 145 |
| 10 | 340 |
| 11 | 823 |
| 12 | 2052 |
| 13 | 5257 |
| 14 | 13816 |
| 15 | 37188 |
| 16 | 102372 |
| 17 | 287862 |
| 18 | 825879 |
| 19 | 2415107 |
| 20 | 7191950 |
| 21 | 21791507 |
| 22 | 67132076 |
| 23 | 210123786 |
| 24 | 667801519 |
| 25 | 2153738687 |
| 26 | 7044944749 |
| 27 | 23360587491 |
| 28 | 78489103731 |