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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 2 |
| 6 | 1 |
| 7 | 4 |
| 8 | 4 |
| 9 | 12 |
| 10 | 15 |
| 11 | 34 |
| 12 | 55 |
| 13 | 110 |
| 14 | 190 |
| 15 | 370 |
| 16 | 664 |
| 17 | 1272 |
| 18 | 2350 |
| 19 | 4466 |
| 20 | 8372 |
| 21 | 15926 |
| 22 | 30105 |
| 23 | 57390 |
| 24 | 109202 |
| 25 | 208738 |
| 26 | 398985 |
| 27 | 764906 |
| 28 | 1467370 |
| 29 | 2820770 |
| 30 | 5427543 |
| 31 | 10459456 |
| 32 | 20176561 |
| 33 | 38969684 |
| 34 | 75339232 |
| 35 | 145804978 |
| 36 | 282429242 |
| 37 | 547573768 |
| 38 | 1062501151 |
| 39 | 2063317650 |