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 | 0 |
| 1 | 1 |
| 2 | 19 |
| 3 | 324 |
| 4 | 5491 |
| 5 | 93025 |
| 6 | 1575936 |
| 7 | 26697889 |
| 8 | 452288179 |
| 9 | 7662201156 |
| 10 | 129805131475 |
| 11 | 2199025033921 |
| 12 | 37253620445184 |
| 13 | 631112522534209 |
| 14 | 10691659262636371 |
| 15 | 181127094942284100 |
| 16 | 3068468954756193331 |