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 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 20 |
| 6 | 50 |
| 7 | 105 |
| 8 | 245 |
| 9 | 504 |
| 10 | 1134 |
| 11 | 2310 |
| 12 | 5082 |
| 13 | 10296 |
| 14 | 22308 |
| 15 | 45045 |
| 16 | 96525 |
| 17 | 194480 |
| 18 | 413270 |
| 19 | 831402 |
| 20 | 1755182 |
| 21 | 3527160 |
| 22 | 7407036 |
| 23 | 14872858 |
| 24 | 31097794 |
| 25 | 62403600 |
| 26 | 130007500 |
| 27 | 260757900 |
| 28 | 541574100 |
| 29 | 1085822640 |
| 30 | 2249204040 |
| 31 | 4508102925 |
| 32 | 9316746045 |