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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 9 |
| 6 | 15 |
| 7 | 25 |
| 8 | 55 |
| 9 | 121 |
| 10 | 231 |
| 11 | 441 |
| 12 | 903 |
| 13 | 1849 |
| 14 | 3655 |
| 15 | 7225 |
| 16 | 14535 |
| 17 | 29241 |
| 18 | 58311 |
| 19 | 116281 |
| 20 | 232903 |
| 21 | 466489 |
| 22 | 932295 |
| 23 | 1863225 |
| 24 | 3727815 |
| 25 | 7458361 |
| 26 | 14913991 |
| 27 | 29822521 |
| 28 | 59650503 |
| 29 | 119311929 |
| 30 | 238612935 |
| 31 | 477204025 |
| 32 | 954429895 |
| 33 | 1908903481 |
| 34 | 3817763271 |
| 35 | 7635439161 |
| 36 | 15270965703 |