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 | 2 |
| 3 | 9 |
| 4 | 74 |
| 5 | 1193 |
| 6 | 38250 |
| 7 | 2449193 |
| 8 | 313534954 |
| 9 | 80267397417 |
| 10 | 41097221012458 |
| 11 | 42083634584154409 |
| 12 | 86187324725569242090 |
| 13 | 353023324159566199755049 |
| 14 | 2891967157702491033962603498 |
| 15 | 47381990264820937260009495466281 |