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 | 5 |
| 4 | 11 |
| 5 | 19 |
| 6 | 45 |
| 7 | 105 |
| 8 | 219 |
| 9 | 475 |
| 10 | 1061 |
| 11 | 2313 |
| 12 | 5027 |
| 13 | 11035 |
| 14 | 24173 |
| 15 | 52793 |
| 16 | 115499 |
| 17 | 252827 |
| 18 | 552981 |
| 19 | 1209545 |
| 20 | 2646419 |
| 21 | 5789563 |
| 22 | 12664925 |
| 23 | 27706873 |
| 24 | 60614235 |
| 25 | 132602171 |
| 26 | 290087749 |
| 27 | 634616521 |
| 28 | 1388325507 |
| 29 | 3037181147 |