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 | 20 |
| 2 | 275 |
| 3 | 3232 |
| 4 | 33466 |
| 5 | 306070 |
| 6 | 2487889 |
| 7 | 18151220 |
| 8 | 120104810 |
| 9 | 727684612 |
| 10 | 4070893254 |
| 11 | 21181152380 |
| 12 | 103146867706 |
| 13 | 472709673984 |
| 14 | 2048611972127 |
| 15 | 8431440391174 |
| 16 | 33079800818118 |
| 17 | 124138709933301 |
| 18 | 446936241587393 |