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 | 0 |
| 2 | 1 |
| 3 | 13 |
| 4 | 156 |
| 5 | 2146 |
| 6 | 34455 |
| 7 | 638723 |
| 8 | 13479760 |
| 9 | 319689156 |
| 10 | 8425695015 |
| 11 | 244459904085 |
| 12 | 7745416087332 |
| 13 | 266155064108662 |
| 14 | 9860698167427471 |
| 15 | 391859875043125895 |