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) |
|---|---|
| 4 | 1 |
| 5 | 11 |
| 6 | 80 |
| 7 | 489 |
| 8 | 2732 |
| 9 | 14512 |
| 10 | 74888 |
| 11 | 380329 |
| 12 | 1916709 |
| 13 | 9637687 |
| 14 | 48528434 |
| 15 | 245289395 |
| 16 | 1246499970 |
| 17 | 6374296278 |
| 18 | 32816505566 |
| 19 | 170106486358 |
| 20 | 887697088316 |
| 21 | 4662338571684 |
| 22 | 24636365887246 |
| 23 | 130918389450108 |
| 24 | 699335986465354 |