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 | 1 |
| 2 | 20195 |
| 3 | 12292965 |
| 4 | 1561991824 |
| 5 | 77226633575 |
| 6 | 2014634387961 |
| 7 | 33098483802475 |
| 8 | 383318212734080 |
| 9 | 3377498614484589 |
| 10 | 23898971839102975 |
| 11 | 141290020118952881 |
| 12 | 719054471032657200 |
| 13 | 3223613105991831475 |
| 14 | 12964037775857022869 |
| 15 | 47453810583528962775 |
| 16 | 159982264435790734336 |