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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 11 |
| 6 | 16 |
| 7 | 57 |
| 8 | 85 |
| 9 | 1507 |
| 10 | 2896 |
| 11 | 12563 |
| 12 | 51074 |
| 13 | 138789 |
| 14 | 2954407 |
| 15 | 7959304 |
| 16 | 38908797 |
| 17 | 178913747 |
| 18 | 1100724688 |
| 19 | 3444477663 |
| 20 | 114462103390 |
| 21 | 358862880667 |
| 22 | 2217915340389 |
| 23 | 11257750157888 |
| 24 | 73465378482214 |
| 25 | 515469706792741 |
| 26 | 2247201695123581 |
| 27 | 98470393431973852 |