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 | 35 |
| 2 | 490 |
| 3 | 4116 |
| 4 | 24696 |
| 5 | 116424 |
| 6 | 457380 |
| 7 | 1557270 |
| 8 | 4723719 |
| 9 | 13026013 |
| 10 | 33157124 |
| 11 | 78835120 |
| 12 | 176729280 |
| 13 | 376375104 |
| 14 | 766192176 |
| 15 | 1498581756 |
| 16 | 2828205765 |
| 17 | 5168991135 |
| 18 | 9177226366 |
| 19 | 15870391460 |
| 20 | 26794167400 |
| 21 | 44253495000 |
| 22 | 71627692500 |
| 23 | 113794603650 |
| 24 | 177694650315 |