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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 17 |
| 5 | 76 |
| 6 | 357 |
| 7 | 1737 |
| 8 | 8997 |
| 9 | 49420 |
| 10 | 289253 |
| 11 | 1793221 |
| 12 | 11727861 |
| 13 | 80576965 |
| 14 | 579781009 |
| 15 | 4356513727 |
| 16 | 34118896917 |
| 17 | 277963716808 |
| 18 | 2351740613433 |
| 19 | 20630800971825 |
| 20 | 187374815249205 |
| 21 | 1759353644746663 |
| 22 | 17055176943817785 |
| 23 | 170477858336708555 |
| 24 | 1754992340756441973 |