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 | 11 |
| 5 | 24 |
| 6 | 56 |
| 7 | 129 |
| 8 | 300 |
| 9 | 698 |
| 10 | 1623 |
| 11 | 3773 |
| 12 | 8771 |
| 13 | 20390 |
| 14 | 47401 |
| 15 | 110194 |
| 16 | 256170 |
| 17 | 595523 |
| 18 | 1384423 |
| 19 | 3218393 |
| 20 | 7481856 |
| 21 | 17393205 |
| 22 | 40434296 |
| 23 | 93998334 |
| 24 | 218519615 |
| 25 | 507996473 |
| 26 | 1180948523 |
| 27 | 2745372238 |
| 28 | 6382216141 |
| 29 | 14836852470 |
| 30 | 34491497366 |