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 | 1 |
| 2 | 7 |
| 3 | 70 |
| 4 | 910 |
| 5 | 14532 |
| 6 | 274778 |
| 7 | 5995892 |
| 8 | 148154860 |
| 9 | 4085619622 |
| 10 | 124304629050 |
| 11 | 4133867297490 |
| 12 | 149114120602860 |
| 13 | 5796433459664946 |
| 14 | 241482353893283349 |
| 15 | 10730629952953517859 |
| 16 | 506500241174366575122 |
| 17 | 25302666611855946733140 |