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 | 0 |
| 2 | 19 |
| 3 | 102 |
| 4 | 735 |
| 5 | 10374 |
| 6 | 116954 |
| 7 | 1413931 |
| 8 | 17336190 |
| 9 | 210669938 |
| 10 | 2579232344 |
| 11 | 31507335039 |
| 12 | 385235115962 |
| 13 | 4709579663351 |
| 14 | 57576031578161 |
| 15 | 703919626655464 |
| 16 | 8605843851625144 |
| 17 | 105213106646598954 |
| 18 | 1286307937687623392 |