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 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 38 |
| 5 | 159 |
| 6 | 888 |
| 7 | 5929 |
| 8 | 46276 |
| 9 | 409163 |
| 10 | 4038086 |
| 11 | 43954887 |
| 12 | 522957240 |
| 13 | 6749978041 |
| 14 | 93928274284 |
| 15 | 1401602642411 |
| 16 | 22324392570758 |
| 17 | 378011820666759 |
| 18 | 6780385526758368 |
| 19 | 128425485935590369 |
| 20 | 2561327494115859316 |
| 21 | 53652269665825304363 |
| 22 | 1177652997443472901166 |