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 | 511 |
| 2 | 19171 |
| 3 | 242461 |
| 4 | 1688101 |
| 5 | 8006491 |
| 6 | 29066311 |
| 7 | 86929081 |
| 8 | 224817481 |
| 9 | 519682231 |
| 10 | 1098972331 |
| 11 | 2162213461 |
| 12 | 4007999341 |
| 13 | 7067000851 |
| 14 | 11941597711 |
| 15 | 19452737521 |
| 16 | 30694626961 |
| 17 | 47097859951 |
| 18 | 70501587571 |
| 19 | 103235334541 |
| 20 | 148211067061 |