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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 12 |
| 5 | 24 |
| 6 | 84 |
| 7 | 195 |
| 8 | 780 |
| 9 | 924 |
| 10 | 29259 |
| 11 | 71484 |
| 12 | 2311539 |
| 13 | 23303784 |
| 14 | 208260975 |
| 15 | 319589424 |
| 16 | 383229924 |
| 17 | 11962377504 |
| 18 | 178523171904 |