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 | 2 |
| 1 | 11 |
| 2 | 65 |
| 3 | 407 |
| 4 | 2657 |
| 5 | 17831 |
| 6 | 121745 |
| 7 | 839927 |
| 8 | 5830337 |
| 9 | 40615751 |
| 10 | 283523825 |
| 11 | 1981521047 |
| 12 | 13858064417 |
| 13 | 96956119271 |
| 14 | 678491508305 |
| 15 | 4748635251767 |
| 16 | 33237225536897 |
| 17 | 232647693856391 |
| 18 | 1628482317387185 |
| 19 | 11399170063280087 |