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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 28 |
| 6 | 80 |
| 7 | 160 |
| 8 | 203 |
| 9 | 560 |
| 10 | 644 |
| 11 | 910 |
| 12 | 34216 |
| 13 | 34972 |
| 14 | 74647 |
| 15 | 87763 |
| 16 | 122420 |
| 17 | 221068 |
| 18 | 225064 |
| 19 | 6731644 |
| 20 | 6877120 |
| 21 | 6927700 |
| 22 | 7723642 |
| 23 | 8128762 |
| 24 | 8271430 |
| 25 | 77894071 |
| 26 | 78526951 |
| 27 | 539212009 |
| 28 | 28476193256 |
| 29 | 200267707484 |
| 30 | 200316968444 |
| 31 | 201509576804 |
| 32 | 201669082004 |
| 33 | 231852949304 |
| 34 | 232018753064 |
| 35 | 232039258376 |
| 36 | 333349186006 |
| 37 | 2947903946317 |
| 38 | 5816975658914 |
| 39 | 5817003372578 |
| 40 | 11610051837124 |
| 41 | 27950430282103 |
| 42 | 81041908142188 |