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 | 13 |
| 2 | 169 |
| 3 | 699 |
| 4 | 3080 |
| 5 | 15839 |
| 6 | 84013 |
| 7 | 463482 |
| 8 | 2593815 |
| 9 | 14711595 |
| 10 | 84048508 |
| 11 | 482923435 |
| 12 | 2784827479 |
| 13 | 16101364492 |
| 14 | 93259442297 |
| 15 | 540832199853 |
| 16 | 3139061893334 |
| 17 | 18230253959839 |
| 18 | 105915789772767 |
| 19 | 615530706047318 |
| 20 | 3577847973579475 |