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 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 3 |
| 8 | 9 |
| 9 | 15 |
| 10 | 38 |
| 11 | 73 |
| 12 | 174 |
| 13 | 380 |
| 14 | 915 |
| 15 | 2124 |
| 16 | 5134 |
| 17 | 12281 |
| 18 | 30010 |
| 19 | 73401 |
| 20 | 181835 |
| 21 | 452165 |
| 22 | 1133252 |
| 23 | 2851710 |
| 24 | 7215262 |
| 25 | 18326528 |
| 26 | 46750268 |
| 27 | 119687146 |
| 28 | 307528889 |
| 29 | 792716193 |
| 30 | 2049703887 |
| 31 | 5314775856 |
| 32 | 13817638615 |
| 33 | 36012395538 |