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 | 1 |
| 2 | 9 |
| 3 | 195 |
| 4 | 7699 |
| 5 | 482309 |
| 6 | 43994741 |
| 7 | 5508667927 |
| 8 | 906931827831 |
| 9 | 189998213001033 |
| 10 | 49359340639141993 |
| 11 | 15573690455085072011 |
| 12 | 5866304418414451865723 |
| 13 | 2600416934781350100016717 |
| 14 | 1340037064604153376788884701 |
| 15 | 794358527033920600533985973631 |