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 | 1 |
| 9 | 5 |
| 10 | 25 |
| 11 | 75 |
| 12 | 225 |
| 13 | 525 |
| 14 | 1225 |
| 15 | 2450 |
| 16 | 4900 |
| 17 | 8820 |
| 18 | 15876 |
| 19 | 26460 |
| 20 | 44100 |
| 21 | 69300 |
| 22 | 108900 |
| 23 | 163350 |
| 24 | 245025 |
| 25 | 353925 |
| 26 | 511225 |
| 27 | 715715 |
| 28 | 1002001 |
| 29 | 1366365 |
| 30 | 1863225 |
| 31 | 2484300 |
| 32 | 3312400 |
| 33 | 4331600 |
| 34 | 5664400 |
| 35 | 7282800 |
| 36 | 9363600 |
| 37 | 11860560 |
| 38 | 15023376 |
| 39 | 18779220 |
| 40 | 23474025 |
| 41 | 28997325 |