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 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 4 |
| 7 | 4 |
| 8 | 16 |
| 9 | 26 |
| 10 | 87 |
| 11 | 181 |
| 12 | 570 |
| 13 | 1453 |
| 14 | 4464 |
| 15 | 13038 |
| 16 | 41548 |
| 17 | 132217 |
| 18 | 442603 |
| 19 | 1506803 |
| 20 | 5305174 |
| 21 | 19092816 |
| 22 | 70548770 |
| 23 | 266495254 |
| 24 | 1029835424 |
| 25 | 4063610148 |
| 26 | 16366919221 |
| 27 | 67217627966 |
| 28 | 281326631801 |
| 29 | 1199048810660 |
| 30 | 5201341196693 |
| 31 | 22950740113039 |
| 32 | 102957953031700 |