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 | 4 |
| 2 | 14 |
| 3 | 54 |
| 4 | 235 |
| 5 | 1119 |
| 6 | 5658 |
| 7 | 29800 |
| 8 | 161621 |
| 9 | 896198 |
| 10 | 5056824 |
| 11 | 28938519 |
| 12 | 167548937 |
| 13 | 979653821 |
| 14 | 5776252440 |
| 15 | 34305807512 |
| 16 | 205039491091 |
| 17 | 1232333298174 |
| 18 | 7443336041318 |
| 19 | 45157243590384 |
| 20 | 275051410542141 |
| 21 | 1681362181696823 |
| 22 | 10311616254855422 |
| 23 | 63428758470722109 |