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 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 43 |
| 5 | 161 |
| 6 | 901 |
| 7 | 5579 |
| 8 | 43206 |
| 9 | 378360 |
| 10 | 3742738 |
| 11 | 40853520 |
| 12 | 488029621 |
| 13 | 6323154547 |
| 14 | 88308425755 |
| 15 | 1322120265238 |
| 16 | 21122364398761 |
| 17 | 358647945023885 |
| 18 | 6449299885654827 |
| 19 | 122436442904193940 |
| 20 | 2447046870232798369 |
| 21 | 51358050784584629338 |
| 22 | 1129314001779283063606 |