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 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 2 |
| 7 | 6 |
| 8 | 9 |
| 9 | 20 |
| 10 | 37 |
| 11 | 86 |
| 12 | 181 |
| 13 | 422 |
| 14 | 943 |
| 15 | 2223 |
| 16 | 5225 |
| 17 | 12613 |
| 18 | 30513 |
| 19 | 74883 |
| 20 | 184484 |
| 21 | 458561 |
| 22 | 1145406 |
| 23 | 2879870 |
| 24 | 7274983 |
| 25 | 18471060 |
| 26 | 47089144 |
| 27 | 120528657 |
| 28 | 309576725 |
| 29 | 797790928 |
| 30 | 2062142876 |
| 31 | 5345531935 |
| 32 | 13893615154 |
| 33 | 36201693122 |