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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 18 |
| 7 | 40 |
| 8 | 94 |
| 9 | 224 |
| 10 | 548 |
| 11 | 1356 |
| 12 | 3418 |
| 13 | 8692 |
| 14 | 22352 |
| 15 | 57932 |
| 16 | 151312 |
| 17 | 397628 |
| 18 | 1050992 |
| 19 | 2791516 |
| 20 | 7447972 |
| 21 | 19950628 |
| 22 | 53635310 |
| 23 | 144664640 |
| 24 | 391358274 |
| 25 | 1061628772 |
| 26 | 2887113478 |
| 27 | 7869761108 |
| 28 | 21497678430 |
| 29 | 58841838912 |
| 30 | 161356288874 |