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 | 5 |
| 2 | 73 |
| 3 | 1877 |
| 4 | 69730 |
| 5 | 3363233 |
| 6 | 199205127 |
| 7 | 13982257729 |
| 8 | 1134344816185 |
| 9 | 104416147080712 |
| 10 | 10750872867074587 |
| 11 | 1224163955433850944 |
| 12 | 152733676280699540999 |
| 13 | 20719969553916698313305 |
| 14 | 3036565789908881887393114 |
| 15 | 478082645334119488823777215 |
| 16 | 80475210949356295594385157621 |