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 | 1 |
| 1 | 1012 |
| 2 | 141726 |
| 3 | 6503112 |
| 4 | 130905236 |
| 5 | 1392036360 |
| 6 | 9401213016 |
| 7 | 47412641232 |
| 8 | 192747766686 |
| 9 | 663612939132 |
| 10 | 2007831887432 |
| 11 | 5456890474248 |
| 12 | 13617909938952 |
| 13 | 31527898462552 |
| 14 | 68719323996224 |
| 15 | 141662701280848 |
| 16 | 279248601010324 |
| 17 | 527242669347856 |
| 18 | 961796734667878 |
| 19 | 1695182770403416 |