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 | 21 |
| 2 | 70 |
| 3 | 86 |
| 4 | 466 |
| 5 | 11620 |
| 6 | 46664 |
| 7 | 19639 |
| 8 | 1992563 |
| 9 | 19428961 |
| 10 | 27064328 |
| 11 | 185609499 |
| 12 | 6071753195 |
| 13 | 27077249191 |
| 14 | 10857445569 |
| 15 | 1382034290296 |
| 16 | 15507764357015 |
| 17 | 22979292470431 |
| 18 | 166552455290745 |
| 19 | 5855288096822543 |
| 20 | 26804755495077100 |