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 | 10 |
| 4 | 26 |
| 5 | 58 |
| 6 | 167 |
| 7 | 414 |
| 8 | 1324 |
| 9 | 3606 |
| 10 | 12729 |
| 11 | 37674 |
| 12 | 145578 |
| 13 | 463770 |
| 14 | 1944879 |
| 15 | 6614190 |
| 16 | 29852856 |
| 17 | 107616150 |
| 18 | 518782545 |
| 19 | 1970493210 |
| 20 | 10077228270 |
| 21 | 40125873690 |
| 22 | 216425656215 |
| 23 | 899557170750 |
| 24 | 5091758227620 |
| 25 | 22011865939350 |
| 26 | 130202223160905 |
| 27 | 583641857191050 |
| 28 | 3594820517111250 |