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 | 3 |
| 3 | 7 |
| 4 | 37 |
| 5 | 225 |
| 6 | 2707 |
| 7 | 47991 |
| 8 | 1566965 |
| 9 | 85002865 |
| 10 | 8346008131 |
| 11 | 1441358958439 |
| 12 | 452666387604933 |
| 13 | 257384373709193473 |
| 14 | 268828878795481175283 |
| 15 | 516988085848458847554135 |
| 16 | 1844678455777198460320221077 |