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 | 3 |
| 1 | 19 |
| 2 | 139 |
| 3 | 1099 |
| 4 | 9043 |
| 5 | 76099 |
| 6 | 649819 |
| 7 | 5608699 |
| 8 | 48818083 |
| 9 | 427793779 |
| 10 | 3769318699 |
| 11 | 33358563499 |
| 12 | 296271355123 |
| 13 | 2638756433059 |
| 14 | 23555020310779 |
| 15 | 210638707953499 |
| 16 | 1886253162468163 |
| 17 | 16909812342793939 |
| 18 | 151723049282330059 |