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 | 11 |
| 2 | 76 |
| 3 | 521 |
| 4 | 3571 |
| 5 | 24476 |
| 6 | 167761 |
| 7 | 1149851 |
| 8 | 7881196 |
| 9 | 54018521 |
| 10 | 370248451 |
| 11 | 2537720636 |
| 12 | 17393796001 |
| 13 | 119218851371 |
| 14 | 817138163596 |
| 15 | 5600748293801 |
| 16 | 38388099893011 |
| 17 | 263115950957276 |
| 18 | 1803423556807921 |
| 19 | 12360848946698171 |