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 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 3 |
| 6 | 3 |
| 7 | 12 |
| 8 | 30 |
| 9 | 45 |
| 10 | 75 |
| 11 | 192 |
| 12 | 436 |
| 13 | 798 |
| 14 | 1554 |
| 15 | 3542 |
| 16 | 7740 |
| 17 | 15543 |
| 18 | 32183 |
| 19 | 70794 |
| 20 | 153252 |
| 21 | 321431 |
| 22 | 684123 |
| 23 | 1491504 |
| 24 | 3232672 |
| 25 | 6928779 |
| 26 | 14957787 |
| 27 | 32615388 |
| 28 | 70991040 |
| 29 | 153985890 |
| 30 | 335256886 |
| 31 | 733206840 |
| 32 | 1603258134 |
| 33 | 3503385568 |
| 34 | 7671749664 |
| 35 | 16837946850 |