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 | 166 |
| 3 | 5482 |
| 4 | 109640 |
| 5 | 1709675 |
| 6 | 23077694 |
| 7 | 284433852 |
| 8 | 3300384000 |
| 9 | 36740695125 |
| 10 | 397251942790 |
| 11 | 4206505251886 |
| 12 | 43874389439176 |
| 13 | 452588032465727 |
| 14 | 4630933106076350 |
| 15 | 47101176806668160 |
| 16 | 476947462419456864 |
| 17 | 4813761757416769257 |
| 18 | 48466731584985480870 |
| 19 | 487104579690137249650 |
| 20 | 4889039701269534580360 |