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 | 5 |
| 3 | 34 |
| 4 | 326 |
| 5 | 3988 |
| 6 | 59604 |
| 7 | 1052848 |
| 8 | 21460092 |
| 9 | 495764693 |
| 10 | 12800845441 |
| 11 | 365323615365 |
| 12 | 11419131242070 |
| 13 | 387977390372849 |
| 14 | 14236659589753581 |
| 15 | 561109543344974893 |
| 16 | 23640346895461300427 |
| 17 | 1060265646084471617079 |
| 18 | 50434955069054663240727 |
| 19 | 2536202597745552881270240 |