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 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 23 |
| 4 | 175 |
| 5 | 1935 |
| 6 | 28432 |
| 7 | 523290 |
| 8 | 11587072 |
| 9 | 299942890 |
| 10 | 8886126540 |
| 11 | 296438370794 |
| 12 | 10993731095695 |
| 13 | 448604373236731 |
| 14 | 19971257117211555 |
| 15 | 963142501803505255 |
| 16 | 50015707804752012825 |
| 17 | 2782336529985704607295 |