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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 2 |
| 9 | 4 |
| 10 | 8 |
| 11 | 15 |
| 12 | 30 |
| 13 | 60 |
| 14 | 120 |
| 15 | 239 |
| 16 | 476 |
| 17 | 948 |
| 18 | 1888 |
| 19 | 3761 |
| 20 | 7492 |
| 21 | 14924 |
| 22 | 29728 |
| 23 | 59217 |
| 24 | 117958 |
| 25 | 234968 |
| 26 | 468048 |
| 27 | 932335 |
| 28 | 1857178 |
| 29 | 3699432 |
| 30 | 7369136 |
| 31 | 14679055 |
| 32 | 29240152 |
| 33 | 58245336 |
| 34 | 116022624 |
| 35 | 231112913 |
| 36 | 460368648 |
| 37 | 917037864 |
| 38 | 1826706592 |
| 39 | 3638734129 |