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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 19 |
| 5 | 90 |
| 6 | 302 |
| 7 | 820 |
| 8 | 1926 |
| 9 | 4068 |
| 10 | 7920 |
| 11 | 14454 |
| 12 | 25025 |
| 13 | 41470 |
| 14 | 66222 |
| 15 | 102440 |
| 16 | 154156 |
| 17 | 226440 |
| 18 | 325584 |
| 19 | 459306 |
| 20 | 636975 |
| 21 | 869858 |
| 22 | 1171390 |
| 23 | 1557468 |
| 24 | 2046770 |
| 25 | 2661100 |
| 26 | 3425760 |
| 27 | 4369950 |
| 28 | 5527197 |
| 29 | 6935814 |
| 30 | 8639390 |
| 31 | 10687312 |
| 32 | 13135320 |
| 33 | 16046096 |
| 34 | 19489888 |