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 | 71 |
| 3 | 462 |
| 4 | 4133 |
| 5 | 27130 |
| 6 | 186732 |
| 7 | 1187838 |
| 8 | 7529253 |
| 9 | 46440962 |
| 10 | 283673207 |
| 11 | 1710265892 |
| 12 | 10226321520 |
| 13 | 60660804228 |
| 14 | 357586190291 |
| 15 | 2096177689750 |
| 16 | 12229766790505 |
| 17 | 71054027831574 |
| 18 | 411303965509420 |
| 19 | 2373090804832634 |