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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 3 |
| 5 | 11 |
| 6 | 20 |
| 7 | 51 |
| 8 | 99 |
| 9 | 222 |
| 10 | 441 |
| 11 | 935 |
| 12 | 1872 |
| 13 | 3863 |
| 14 | 7751 |
| 15 | 15774 |
| 16 | 31653 |
| 17 | 63939 |
| 18 | 128232 |
| 19 | 257963 |
| 20 | 517011 |
| 21 | 1037630 |
| 22 | 2078417 |
| 23 | 4165647 |
| 24 | 8340192 |
| 25 | 16702191 |
| 26 | 33428943 |
| 27 | 66912446 |
| 28 | 133891725 |
| 29 | 267921227 |
| 30 | 536022488 |
| 31 | 1072395555 |
| 32 | 2145272571 |
| 33 | 4291442718 |
| 34 | 8584166169 |