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 | 30 |
| 2 | 565 |
| 3 | 8550 |
| 4 | 113701 |
| 5 | 1388310 |
| 6 | 15958405 |
| 7 | 175419750 |
| 8 | 1863406501 |
| 9 | 19269697590 |
| 10 | 195034120645 |
| 11 | 1939826329350 |
| 12 | 19018419228901 |
| 13 | 184245490086870 |
| 14 | 1767124523521285 |
| 15 | 16805853434269350 |
| 16 | 158682246543588901 |
| 17 | 1489103597614860150 |
| 18 | 13900428943759584325 |