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 | 1 |
| 2 | 7 |
| 3 | 127 |
| 4 | 5167 |
| 5 | 368047 |
| 6 | 40284847 |
| 7 | 6267305647 |
| 8 | 1313941673647 |
| 9 | 357001369769647 |
| 10 | 122002101778601647 |
| 11 | 51212944273488041647 |
| 12 | 25903229683158464681647 |
| 13 | 15537113273014144448681647 |
| 14 | 10904406563691366305216681647 |
| 15 | 8852666400303393320848832681647 |
| 16 | 8231691320578226211046411712681647 |