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 | 281525 |
| 3 | 1011881 |
| 4 | 13721649 |
| 5 | 309777093 |
| 6 | 417800903 |
| 7 | 12252701193 |
| 8 | 27377813605 |
| 9 | 37762351523 |
| 10 | 245773819141 |
| 11 | 51230573255953 |
| 12 | 82578361848569 |
| 13 | 277900491430385 |