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 | 10 |
| 2 | 48 |
| 3 | 250 |
| 4 | 1392 |
| 5 | 8050 |
| 6 | 47448 |
| 7 | 282250 |
| 8 | 1686432 |
| 9 | 10097890 |
| 10 | 60526248 |
| 11 | 362976250 |
| 12 | 2177317872 |
| 13 | 13062296530 |
| 14 | 78368963448 |
| 15 | 470199366250 |
| 16 | 2821153019712 |
| 17 | 16926788715970 |
| 18 | 101560344351048 |
| 19 | 609360902796250 |
| 20 | 3656161927895952 |
| 21 | 21936961102828210 |