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 | 26 |
| 4 | 245 |
| 5 | 1353 |
| 6 | 5368 |
| 7 | 17017 |
| 8 | 45878 |
| 9 | 109446 |
| 10 | 237291 |
| 11 | 476476 |
| 12 | 898403 |
| 13 | 1607255 |
| 14 | 2750202 |
| 15 | 4529539 |
| 16 | 7216924 |
| 17 | 11169884 |
| 18 | 16850757 |
| 19 | 24848238 |
| 20 | 35901697 |
| 21 | 50928437 |
| 22 | 71054060 |
| 23 | 97646109 |
| 24 | 132351154 |
| 25 | 177135490 |
| 26 | 234329615 |
| 27 | 306676656 |
| 28 | 397384911 |
| 29 | 510184675 |
| 30 | 649389518 |