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 | 0 |
| 4 | 30 |
| 5 | 1945 |
| 6 | 41901 |
| 7 | 410505 |
| 8 | 2363160 |
| 9 | 9266220 |
| 10 | 27058460 |
| 11 | 62261590 |
| 12 | 117178540 |
| 13 | 185037520 |
| 14 | 249548910 |
| 15 | 290969170 |
| 16 | 295695540 |
| 17 | 263173865 |
| 18 | 205581235 |
| 19 | 140943485 |
| 20 | 84636895 |
| 21 | 44347105 |
| 22 | 20159615 |
| 23 | 7888705 |
| 24 | 2629575 |
| 25 | 736281 |
| 26 | 169911 |
| 27 | 31465 |
| 28 | 4495 |
| 29 | 465 |
| 30 | 31 |
| 31 | 1 |