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 | 4 |
| 3 | 8 |
| 4 | 61 |
| 5 | 221 |
| 6 | 442 |
| 7 | 884 |
| 8 | 8671 |
| 9 | 24371 |
| 10 | 60721 |
| 11 | 244121 |
| 12 | 881371 |
| 13 | 2898371 |
| 14 | 8692591 |
| 15 | 48826601 |
| 16 | 97653202 |
| 17 | 484336211 |
| 18 | 968672422 |
| 19 | 6847550561 |
| 20 | 24334620331 |
| 21 | 68473110671 |
| 22 | 247696944631 |
| 23 | 884738088671 |
| 24 | 2892570042961 |
| 25 | 8872433043671 |
| 26 | 44817108207511 |
| 27 | 89634216415022 |
| 28 | 486415512459511 |