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 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 2 |
| 5 | 6 |
| 6 | 19 |
| 7 | 41 |
| 8 | 99 |
| 9 | 307 |
| 10 | 750 |
| 11 | 2062 |
| 12 | 5776 |
| 13 | 15674 |
| 14 | 43700 |
| 15 | 123729 |
| 16 | 345728 |
| 17 | 982580 |
| 18 | 2801615 |
| 19 | 7994268 |
| 20 | 22953104 |
| 21 | 66128105 |
| 22 | 190846074 |
| 23 | 552959720 |
| 24 | 1605817449 |
| 25 | 4673526011 |
| 26 | 13635237816 |
| 27 | 39860703465 |
| 28 | 116739997283 |
| 29 | 342538898105 |
| 30 | 1006709394181 |
| 31 | 2963267980415 |
| 32 | 8735388348630 |