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 | 5 |
| 3 | 35 |
| 4 | 157 |
| 5 | 1123 |
| 6 | 5021 |
| 7 | 35939 |
| 8 | 160669 |
| 9 | 1150051 |
| 10 | 5141405 |
| 11 | 36801635 |
| 12 | 164524957 |
| 13 | 1177652323 |
| 14 | 5264798621 |
| 15 | 37684874339 |
| 16 | 168473555869 |
| 17 | 1205915978851 |
| 18 | 5391153787805 |
| 19 | 38589311323235 |
| 20 | 172516921209757 |
| 21 | 1234857962343523 |