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 | 3 |
| 3 | 19 |
| 4 | 195 |
| 5 | 2831 |
| 6 | 53703 |
| 7 | 1264467 |
| 8 | 35661979 |
| 9 | 1173865927 |
| 10 | 44218244943 |
| 11 | 1877050837355 |
| 12 | 88693432799667 |
| 13 | 4618194424504623 |
| 14 | 262771389992099719 |
| 15 | 16223185411792992403 |
| 16 | 1080238361814167993739 |
| 17 | 77171781603974127429527 |