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 | 9 |
| 2 | 40 |
| 3 | 243 |
| 4 | 1640 |
| 5 | 11809 |
| 6 | 88573 |
| 7 | 683281 |
| 8 | 5380840 |
| 9 | 43046721 |
| 10 | 348678440 |
| 11 | 2852823600 |
| 12 | 23535794706 |
| 13 | 195528140640 |
| 14 | 1634056603925 |
| 15 | 13726075472976 |
| 16 | 115813761803240 |
| 17 | 981010688215680 |
| 18 | 8338590849833284 |
| 19 | 71097458824894320 |