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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 5 |
| 7 | 10 |
| 8 | 34 |
| 9 | 85 |
| 10 | 254 |
| 11 | 690 |
| 12 | 1997 |
| 13 | 5582 |
| 14 | 15975 |
| 15 | 45244 |
| 16 | 129254 |
| 17 | 368215 |
| 18 | 1052961 |
| 19 | 3010169 |
| 20 | 8622273 |
| 21 | 24709964 |
| 22 | 70902886 |
| 23 | 203594559 |
| 24 | 585163116 |
| 25 | 1683079071 |
| 26 | 4844758076 |
| 27 | 13955265122 |
| 28 | 40225474849 |
| 29 | 116021495035 |
| 30 | 334843170810 |
| 31 | 966929417619 |
| 32 | 2793756318793 |