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 | 1 |
| 3 | 2 |
| 4 | 11 |
| 5 | 76 |
| 6 | 649 |
| 7 | 6173 |
| 8 | 63429 |
| 9 | 688898 |
| 10 | 7808246 |
| 11 | 91537482 |
| 12 | 1102931565 |
| 13 | 13594564857 |
| 14 | 170804438005 |
| 15 | 2181426973452 |
| 16 | 28257128116954 |
| 17 | 370581034530685 |
| 18 | 4913238656392058 |
| 19 | 65773613137623085 |
| 20 | 888155942037325535 |
| 21 | 12086555915234897267 |
| 22 | 165641209243876120135 |