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 | 3 |
| 2 | 34 |
| 3 | 299 |
| 4 | 2625 |
| 5 | 23378 |
| 6 | 210035 |
| 7 | 1904324 |
| 8 | 17427258 |
| 9 | 160788536 |
| 10 | 1493776443 |
| 11 | 13959990342 |
| 12 | 131126017178 |
| 13 | 1237088048653 |
| 14 | 11715902308080 |
| 15 | 111329817298881 |
| 16 | 1061057292827269 |
| 17 | 10139482913717352 |
| 18 | 97123037685177087 |
| 19 | 932300026230174178 |
| 20 | 8966605849641219022 |
| 21 | 86389956293761485464 |
| 22 | 833671466551239927908 |
| 23 | 8056846659984852885191 |