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 | 42 |
| 2 | 1911 |
| 3 | 89180 |
| 4 | 4213755 |
| 5 | 200574738 |
| 6 | 9594158301 |
| 7 | 460519598448 |
| 8 | 22162505675310 |
| 9 | 1068725273676060 |
| 10 | 51619430718553698 |
| 11 | 2496503376570051576 |
| 12 | 120872371815599997138 |
| 13 | 5857661095679076784380 |
| 14 | 284096563140435224042430 |
| 15 | 13788153197749122873525936 |