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 | 2 |
| 2 | 15 |
| 3 | 292 |
| 4 | 10845 |
| 5 | 653406 |
| 6 | 58018051 |
| 7 | 7123041416 |
| 8 | 1155276253305 |
| 9 | 239189245299010 |
| 10 | 61550396579410431 |
| 11 | 19268616527909790636 |
| 12 | 7210621330821550184725 |
| 13 | 3178541959877575827583334 |
| 14 | 1630110354806890680999093435 |
| 15 | 962286069560027427207269245456 |