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 | 4 |
| 5 | 12 |
| 6 | 30 |
| 7 | 68 |
| 8 | 144 |
| 9 | 291 |
| 10 | 568 |
| 11 | 1080 |
| 12 | 2012 |
| 13 | 3688 |
| 14 | 6672 |
| 15 | 11941 |
| 16 | 21180 |
| 17 | 37284 |
| 18 | 65210 |
| 19 | 113420 |
| 20 | 196320 |
| 21 | 338375 |
| 22 | 581040 |
| 23 | 994416 |
| 24 | 1696824 |
| 25 | 2887632 |
| 26 | 4902240 |
| 27 | 8304073 |
| 28 | 14038324 |
| 29 | 23688636 |
| 30 | 39905238 |
| 31 | 67118420 |
| 32 | 112726512 |
| 33 | 189072363 |