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 | 15 |
| 2 | 190 |
| 3 | 2300 |
| 4 | 27405 |
| 5 | 324632 |
| 6 | 3838380 |
| 7 | 45379620 |
| 8 | 536878650 |
| 9 | 6358402050 |
| 10 | 75394027566 |
| 11 | 895068996640 |
| 12 | 10638894058520 |
| 13 | 126600387152400 |
| 14 | 1508152231077400 |
| 15 | 17984495151670680 |
| 16 | 214667221708410075 |
| 17 | 2564603660132096265 |
| 18 | 30664510802988208300 |
| 19 | 366934961273420740200 |