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 | 6 |
| 2 | 38 |
| 3 | 302 |
| 4 | 2987 |
| 5 | 35296 |
| 6 | 481675 |
| 7 | 7412010 |
| 8 | 126421018 |
| 9 | 2359544825 |
| 10 | 47713420896 |
| 11 | 1037071688566 |
| 12 | 24072357120951 |
| 13 | 593510886093458 |
| 14 | 15472489081555834 |
| 15 | 424833140882979666 |
| 16 | 12244337906265312999 |
| 17 | 369340369943742560692 |
| 18 | 11629466311376482334088 |