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 | 4 |
| 4 | 7 |
| 5 | 34 |
| 6 | 70 |
| 7 | 368 |
| 8 | 819 |
| 9 | 4495 |
| 10 | 10472 |
| 11 | 59052 |
| 12 | 141778 |
| 13 | 814506 |
| 14 | 1997688 |
| 15 | 11633440 |
| 16 | 28989675 |
| 17 | 170574723 |
| 18 | 430321633 |
| 19 | 2552698720 |
| 20 | 6503352856 |
| 21 | 38832808586 |
| 22 | 99726673130 |
| 23 | 598724403680 |
| 24 | 1547847846090 |
| 25 | 9335085772194 |
| 26 | 24269405074740 |
| 27 | 146936230074004 |
| 28 | 383846168712104 |