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 | 5 |
| 1 | 0 |
| 2 | 9 |
| 3 | 81 |
| 4 | 297 |
| 5 | 891 |
| 6 | 1683 |
| 7 | 8019 |
| 8 | 5049 |
| 9 | 18513 |
| 10 | 15147 |
| 11 | 88209 |
| 12 | 31977 |
| 13 | 1185921 |
| 14 | 136323 |
| 15 | 166617 |
| 16 | 95931 |
| 17 | 7144929 |
| 18 | 351747 |