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 | 17 |
| 3 | 217 |
| 4 | 3281 |
| 5 | 50101 |
| 6 | 782153 |
| 7 | 12354469 |
| 8 | 197018321 |
| 9 | 3164588407 |
| 10 | 51125645317 |
| 11 | 829858058019 |
| 12 | 13522838817929 |
| 13 | 221088393889403 |
| 14 | 3624855419439957 |
| 15 | 59576725303913167 |
| 16 | 981272544393935569 |
| 17 | 16192709833199300337 |
| 18 | 267654541150392845543 |
| 19 | 4430755975190532983531 |