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 | 25 |
| 3 | 154 |
| 4 | 1590 |
| 5 | 17535 |
| 6 | 763 |
| 7 | 710101 |
| 8 | 22931746 |
| 9 | 24658602 |
| 10 | 386980413 |
| 11 | 15647738229 |
| 12 | 368299898267 |
| 13 | 2164164669333 |
| 14 | 5758910552710 |
| 15 | 46970519777308 |