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 | 29 |
| 3 | 96 |
| 4 | 529 |
| 5 | 3620 |
| 6 | 13101 |
| 7 | 66048 |
| 8 | 325601 |
| 9 | 1653380 |
| 10 | 9189501 |
| 11 | 40187552 |
| 12 | 216562929 |
| 13 | 1143607140 |
| 14 | 5098589837 |
| 15 | 26660767488 |
| 16 | 161932208321 |
| 17 | 635945960964 |
| 18 | 4313170161629 |
| 19 | 20567937335008 |
| 20 | 74804061006033 |
| 21 | 551572049610276 |
| 22 | 2689136522898669 |
| 23 | 10088864973699328 |
| 24 | 67578042506892449 |