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 | 1 |
| 3 | 7 |
| 4 | 97 |
| 5 | 2251 |
| 6 | 80821 |
| 7 | 4305127 |
| 8 | 332273257 |
| 9 | 36630174931 |
| 10 | 5711638291981 |
| 11 | 1249898984911567 |
| 12 | 381230073532620577 |
| 13 | 161042140788424003291 |
| 14 | 93667063572594041040421 |
| 15 | 74610767840852891620692727 |
| 16 | 80997478506602342803118178457 |
| 17 | 119313601058907927882431190269731 |
| 18 | 237541348427311374857037021264415741 |