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) |
|---|---|
| 2 | 1 |
| 3 | 12 |
| 4 | 114 |
| 5 | 1030 |
| 6 | 9290 |
| 7 | 84840 |
| 8 | 787082 |
| 9 | 7415814 |
| 10 | 70867212 |
| 11 | 685839770 |
| 12 | 6712285600 |
| 13 | 66349573368 |
| 14 | 661680191832 |
| 15 | 6651030871168 |
| 16 | 67329662060890 |
| 17 | 685953949494774 |
| 18 | 7028941367108708 |
| 19 | 72403769391718890 |