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 | 18 |
| 2 | 184 |
| 3 | 1842 |
| 4 | 18736 |
| 5 | 193818 |
| 6 | 2033704 |
| 7 | 21584322 |
| 8 | 231136096 |
| 9 | 2492165418 |
| 10 | 27011166424 |
| 11 | 293901605202 |
| 12 | 3207147853456 |
| 13 | 35072467957818 |
| 14 | 384147880094344 |
| 15 | 4212432541504482 |
| 16 | 46231204840282816 |
| 17 | 507698828312979018 |
| 18 | 5577931712001713464 |
| 19 | 61303205636490402162 |
| 20 | 673902916437166856176 |