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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 45 |
| 6 | 2193 |
| 7 | 7671 |
| 8 | 35889 |
| 9 | 53835 |
| 10 | 74825 |
| 11 | 3026205 |
| 12 | 31953871 |
| 13 | 86582437 |
| 14 | 117169915 |
| 15 | 128873391 |
| 16 | 701373669 |
| 17 | 868430067 |
| 18 | 15262037703 |
| 19 | 45305389845 |
| 20 | 104484026691 |
| 21 | 614071181169 |
| 22 | 14894476590363 |
| 23 | 24382189266573 |
| 24 | 86808432666553 |
| 25 | 869188423288227 |
| 26 | 1352557858988953 |