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 | 3 |
| 3 | 17 |
| 4 | 131 |
| 5 | 1177 |
| 6 | 11531 |
| 7 | 119201 |
| 8 | 1276771 |
| 9 | 14015401 |
| 10 | 156585211 |
| 11 | 1772626673 |
| 12 | 20275611347 |
| 13 | 233912585849 |
| 14 | 2718842818923 |
| 15 | 31816917837377 |
| 16 | 374657837729987 |
| 17 | 4436890509548617 |