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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 16 |
| 6 | 61 |
| 7 | 268 |
| 8 | 1329 |
| 9 | 7336 |
| 10 | 44585 |
| 11 | 295772 |
| 12 | 2126715 |
| 13 | 16477258 |
| 14 | 136864245 |
| 15 | 1213428718 |
| 16 | 11438634553 |
| 17 | 114254173932 |
| 18 | 1205496223411 |
| 19 | 13398178039706 |
| 20 | 156464491167265 |
| 21 | 1915485392571130 |
| 22 | 24531500141570723 |
| 23 | 328032365192587366 |
| 24 | 4571816365501050767 |
| 25 | 66302821042903175424 |
| 26 | 999058724695054222539 |
| 27 | 15619164791519468367584 |
| 28 | 253027004031514936296681 |
| 29 | 4242198305180479892604194 |