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 | 5 |
| 3 | 14 |
| 4 | 37 |
| 5 | 98 |
| 6 | 259 |
| 7 | 682 |
| 8 | 1791 |
| 9 | 4697 |
| 10 | 12303 |
| 11 | 32196 |
| 12 | 84199 |
| 13 | 220087 |
| 14 | 575067 |
| 15 | 1502176 |
| 16 | 3923117 |
| 17 | 10244069 |
| 18 | 26746171 |
| 19 | 69825070 |
| 20 | 182276806 |
| 21 | 475804961 |
| 22 | 1241965456 |
| 23 | 3241732629 |
| 24 | 8461261457 |
| 25 | 22084402087 |
| 26 | 57640875725 |
| 27 | 150442742575 |
| 28 | 392652788250 |
| 29 | 1024810764496 |