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 | 18 |
| 2 | 225 |
| 3 | 2430 |
| 4 | 24381 |
| 5 | 234738 |
| 6 | 2205225 |
| 7 | 20404710 |
| 8 | 186995061 |
| 9 | 1703091258 |
| 10 | 15448694625 |
| 11 | 139763668590 |
| 12 | 1262226050541 |
| 13 | 11386154248578 |
| 14 | 102632111782425 |
| 15 | 924629361662070 |
| 16 | 8327306431726821 |
| 17 | 74979611075290698 |