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 | 6 |
| 3 | 71 |
| 4 | 1336 |
| 5 | 35233 |
| 6 | 1205605 |
| 7 | 50905881 |
| 8 | 2561801682 |
| 9 | 149816972193 |
| 10 | 9988787022964 |
| 11 | 748036456826960 |
| 12 | 62173668375158492 |
| 13 | 5679720951862607185 |
| 14 | 565666934647950245036 |
| 15 | 61000592050512159666215 |