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 | 31 |
| 2 | 191 |
| 3 | 5119 |
| 4 | 114687 |
| 5 | 46137343 |
| 6 | 872415231 |
| 7 | 292057776127 |
| 8 | 5222680231935 |
| 9 | 1618481116086271 |
| 10 | 8358680908399640575 |
| 11 | 142962266571249025023 |
| 12 | 698910239464707491627007 |
| 13 | 198263834416799184651812863 |
| 14 | 3326963855579459488791396351 |
| 15 | 930930909542605966724141416447 |