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 | 16 |
| 2 | 106 |
| 3 | 820 |
| 4 | 6898 |
| 5 | 60316 |
| 6 | 536266 |
| 7 | 4801540 |
| 8 | 43118818 |
| 9 | 387702316 |
| 10 | 3487892026 |
| 11 | 31385431060 |
| 12 | 282446845138 |
| 13 | 2541934531516 |
| 14 | 22877065673386 |
| 15 | 205892220185380 |
| 16 | 1853024526865858 |
| 17 | 16677199008675916 |
| 18 | 150094704403896346 |