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 | 0 |
| 3 | 1 |
| 4 | 14 |
| 5 | 277 |
| 6 | 2154 |
| 7 | 10855 |
| 8 | 39926 |
| 9 | 120961 |
| 10 | 315150 |
| 11 | 737089 |
| 12 | 1577406 |
| 13 | 3150841 |
| 14 | 5934034 |
| 15 | 10651567 |
| 16 | 18332614 |
| 17 | 30452605 |
| 18 | 49011606 |
| 19 | 76753681 |
| 20 | 117268590 |
| 21 | 175315789 |
| 22 | 256949306 |
| 23 | 369978631 |
| 24 | 524114454 |
| 25 | 731604457 |
| 26 | 1007394974 |
| 27 | 1369985905 |
| 28 | 1841600286 |
| 29 | 2449309201 |
| 30 | 3225197730 |