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 | 1 |
| 4 | 3 |
| 5 | 8 |
| 6 | 20 |
| 7 | 45 |
| 8 | 105 |
| 9 | 224 |
| 10 | 504 |
| 11 | 1050 |
| 12 | 2310 |
| 13 | 4752 |
| 14 | 10296 |
| 15 | 21021 |
| 16 | 45045 |
| 17 | 91520 |
| 18 | 194480 |
| 19 | 393822 |
| 20 | 831402 |
| 21 | 1679600 |
| 22 | 3527160 |
| 23 | 7113106 |
| 24 | 14872858 |
| 25 | 29953728 |
| 26 | 62403600 |
| 27 | 125550100 |
| 28 | 260757900 |
| 29 | 524190240 |
| 30 | 1085822640 |
| 31 | 2181340125 |
| 32 | 4508102925 |
| 33 | 9051563520 |
| 34 | 18668849760 |