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 | 0 |
| 4 | 12 |
| 5 | 575 |
| 6 | 9837 |
| 7 | 63553 |
| 8 | 265008 |
| 9 | 853497 |
| 10 | 2312925 |
| 11 | 5532967 |
| 12 | 12037068 |
| 13 | 24293243 |
| 14 | 46125317 |
| 15 | 83243925 |
| 16 | 143918272 |
| 17 | 239811333 |
| 18 | 387002853 |
| 19 | 607226187 |
| 20 | 929346700 |
| 21 | 1391111127 |
| 22 | 2041198973 |
| 23 | 2941608713 |
| 24 | 4170413232 |
| 25 | 5824920625 |
| 26 | 8025278157 |
| 27 | 10918558863 |
| 28 | 14683371948 |
| 29 | 19535039827 |
| 30 | 25731386325 |