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 | 10 |
| 3 | 72 |
| 4 | 559 |
| 5 | 4459 |
| 6 | 36960 |
| 7 | 316066 |
| 8 | 2760321 |
| 9 | 24491666 |
| 10 | 220098288 |
| 11 | 1998400235 |
| 12 | 18299775876 |
| 13 | 168773875190 |
| 14 | 1566017986235 |
| 15 | 14606736768049 |
| 16 | 136860923837558 |
| 17 | 1287462389890262 |