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 | 49 |
| 2 | 1372 |
| 3 | 28812 |
| 4 | 504210 |
| 5 | 7764834 |
| 6 | 108707676 |
| 7 | 1413199788 |
| 8 | 17311697403 |
| 9 | 201969803035 |
| 10 | 2262061793992 |
| 11 | 24471395771368 |
| 12 | 256949655599364 |
| 13 | 2628792630362724 |
| 14 | 26287926303627240 |
| 15 | 257621677775546952 |