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 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 25 |
| 4 | 52 |
| 5 | 52 |
| 6 | 538 |
| 7 | 1267 |
| 8 | 1267 |
| 9 | 1267 |
| 10 | 20950 |
| 11 | 20950 |
| 12 | 198097 |
| 13 | 1260979 |
| 14 | 1260979 |
| 15 | 6043948 |
| 16 | 6043948 |
| 17 | 92137390 |
| 18 | 92137390 |
| 19 | 866978368 |
| 20 | 2029239835 |
| 21 | 5516024236 |
| 22 | 26436730642 |
| 23 | 57817790251 |
| 24 | 246104147905 |
| 25 | 810963220867 |
| 26 | 1658251830310 |
| 27 | 6741983486968 |
| 28 | 21993178456942 |