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 | 7 |
| 3 | 33 |
| 4 | 130 |
| 5 | 461 |
| 6 | 1525 |
| 7 | 4802 |
| 8 | 14577 |
| 9 | 43025 |
| 10 | 124226 |
| 11 | 352437 |
| 12 | 985821 |
| 13 | 2725858 |
| 14 | 7466185 |
| 15 | 20291193 |
| 16 | 54791842 |
| 17 | 147164525 |
| 18 | 393517477 |
| 19 | 1048395650 |
| 20 | 2784568545 |
| 21 | 7377137441 |
| 22 | 19503081602 |
| 23 | 51470797413 |
| 24 | 135641216685 |
| 25 | 357029910946 |
| 26 | 938837513785 |
| 27 | 2466747164937 |