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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 7 |
| 5 | 19 |
| 6 | 102 |
| 7 | 529 |
| 8 | 631 |
| 9 | 350103 |
| 10 | 1050940 |
| 11 | 4553863 |
| 12 | 5604803 |
| 13 | 133464332 |
| 14 | 272533467 |
| 15 | 2586265535 |
| 16 | 5445064537 |
| 17 | 8031330072 |
| 18 | 2455000736497 |
| 19 | 2463032066569 |
| 20 | 4918032803066 |
| 21 | 7381064869635 |
| 22 | 27061227411971 |
| 23 | 142687201929490 |