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 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 4 |
| 6 | 12 |
| 7 | 20 |
| 8 | 42 |
| 9 | 76 |
| 10 | 144 |
| 11 | 256 |
| 12 | 488 |
| 13 | 892 |
| 14 | 1672 |
| 15 | 3092 |
| 16 | 5798 |
| 17 | 10856 |
| 18 | 20512 |
| 19 | 38652 |
| 20 | 73344 |
| 21 | 139212 |
| 22 | 265312 |
| 23 | 506464 |
| 24 | 969552 |
| 25 | 1858784 |
| 26 | 3571368 |
| 27 | 6871692 |
| 28 | 13244040 |
| 29 | 25558888 |
| 30 | 49392068 |
| 31 | 95555560 |
| 32 | 185075058 |
| 33 | 358812020 |
| 34 | 696308312 |
| 35 | 1352420168 |
| 36 | 2628949868 |