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 | 7 |
| 1 | 127 |
| 2 | 5461 |
| 3 | 299593 |
| 4 | 17895697 |
| 5 | 1108378657 |
| 6 | 69810262081 |
| 7 | 4432676798593 |
| 8 | 282578800148737 |
| 9 | 18049651735527937 |
| 10 | 1154048505100108801 |
| 11 | 73823022692637345793 |
| 12 | 4723519685917965029377 |
| 13 | 302268352895954163081217 |