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 | 7 |
| 3 | 85 |
| 4 | 1279 |
| 5 | 21517 |
| 6 | 387607 |
| 7 | 7312789 |
| 8 | 142648495 |
| 9 | 2853691357 |
| 10 | 58226571271 |
| 11 | 1207062556261 |
| 12 | 25351452769567 |
| 13 | 538285926177325 |
| 14 | 11535690316148215 |
| 15 | 249189167966657845 |
| 16 | 5420206822556721295 |