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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 5 |
| 5 | 26 |
| 6 | 205 |
| 7 | 2404 |
| 8 | 88171 |
| 9 | 1785134 |
| 10 | 2010899 |
| 11 | 58796834 |
| 12 | 639723359 |
| 13 | 657788549 |
| 14 | 2050134685 |
| 15 | 4809019972 |
| 16 | 6114530474 |
| 17 | 11931055777 |
| 18 | 1292089439947 |
| 19 | 1294667166242 |
| 20 | 4586221808305 |