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 | 109 |
| 3 | 11989 |
| 4 | 1318681 |
| 5 | 145042921 |
| 6 | 15953402629 |
| 7 | 1754729246269 |
| 8 | 193004263686961 |
| 9 | 21228714276319441 |
| 10 | 2334965566131451549 |
| 11 | 256824983560183350949 |
| 12 | 28248413226054037152841 |
| 13 | 3107068629882383903461561 |
| 14 | 341749300873836175343618869 |
| 15 | 37589316027492096903894614029 |