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 | 18 |
| 2 | 36 |
| 3 | 168 |
| 4 | 252 |
| 5 | 336 |
| 6 | 1668 |
| 7 | 3336 |
| 8 | 16668 |
| 9 | 33336 |
| 10 | 166668 |
| 11 | 333336 |
| 12 | 1666668 |
| 13 | 3333336 |
| 14 | 16666668 |
| 15 | 22222224 |
| 16 | 27777780 |
| 17 | 33333336 |
| 18 | 113149848 |
| 19 | 114678900 |
| 20 | 116207952 |
| 21 | 117737004 |
| 22 | 119266056 |
| 23 | 120795108 |
| 24 | 122324160 |
| 25 | 123853212 |