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 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 6 |
| 8 | 11 |
| 9 | 24 |
| 10 | 48 |
| 11 | 109 |
| 12 | 242 |
| 13 | 574 |
| 14 | 1346 |
| 15 | 3258 |
| 16 | 7928 |
| 17 | 19664 |
| 18 | 49158 |
| 19 | 124384 |
| 20 | 316791 |
| 21 | 813231 |
| 22 | 2099326 |
| 23 | 5451613 |
| 24 | 14226697 |
| 25 | 37306971 |
| 26 | 98247737 |
| 27 | 259779698 |
| 28 | 689385447 |
| 29 | 1835644498 |
| 30 | 4902992215 |
| 31 | 13133825317 |
| 32 | 35276818036 |