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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 6 |
| 12 | 36 |
| 13 | 126 |
| 14 | 441 |
| 15 | 1176 |
| 16 | 3136 |
| 17 | 7056 |
| 18 | 15876 |
| 19 | 31752 |
| 20 | 63504 |
| 21 | 116424 |
| 22 | 213444 |
| 23 | 365904 |
| 24 | 627264 |
| 25 | 1019304 |
| 26 | 1656369 |
| 27 | 2576574 |
| 28 | 4008004 |
| 29 | 6012006 |
| 30 | 9018009 |
| 31 | 13117104 |
| 32 | 19079424 |
| 33 | 27029184 |
| 34 | 38291344 |
| 35 | 53018784 |
| 36 | 73410624 |
| 37 | 99628704 |
| 38 | 135210384 |
| 39 | 180280512 |
| 40 | 240374016 |
| 41 | 315490896 |