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 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 45 |
| 8 | 99 |
| 9 | 208 |
| 10 | 437 |
| 11 | 906 |
| 12 | 1862 |
| 13 | 3803 |
| 14 | 7732 |
| 15 | 15659 |
| 16 | 31629 |
| 17 | 63747 |
| 18 | 128258 |
| 19 | 257722 |
| 20 | 517339 |
| 21 | 1037652 |
| 22 | 2079984 |
| 23 | 4167325 |
| 24 | 8346204 |
| 25 | 16710572 |
| 26 | 33449695 |
| 27 | 66944254 |
| 28 | 133959021 |
| 29 | 268028868 |
| 30 | 536231903 |
| 31 | 1072737537 |
| 32 | 2145905285 |
| 33 | 4292486690 |
| 34 | 8586035993 |
| 35 | 17173742032 |
| 36 | 34350108745 |
| 37 | 68704342523 |
| 38 | 137415168084 |