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 | 4 |
| 2 | 22 |
| 3 | 157 |
| 4 | 1291 |
| 5 | 11497 |
| 6 | 107725 |
| 7 | 1045948 |
| 8 | 10428178 |
| 9 | 106126924 |
| 10 | 1097913928 |
| 11 | 11511677470 |
| 12 | 122057782762 |
| 13 | 1306480339462 |
| 14 | 14098243951822 |
| 15 | 153208673236237 |
| 16 | 1675240428936307 |
| 17 | 18417589741637077 |
| 18 | 203464608460961377 |