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 | 25 |
| 4 | 234 |
| 5 | 1290 |
| 6 | 5115 |
| 7 | 16211 |
| 8 | 43700 |
| 9 | 104244 |
| 10 | 226005 |
| 11 | 453805 |
| 12 | 855646 |
| 13 | 1530750 |
| 14 | 2619279 |
| 15 | 4313895 |
| 16 | 6873320 |
| 17 | 10638056 |
| 18 | 16048425 |
| 19 | 23665089 |
| 20 | 34192210 |
| 21 | 48503410 |
| 22 | 67670691 |
| 23 | 92996475 |
| 24 | 126048924 |
| 25 | 168700700 |
| 26 | 223171325 |
| 27 | 292073301 |
| 28 | 378462150 |
| 29 | 485890534 |
| 30 | 618466615 |