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 | 1 |
| 5 | 3 |
| 6 | 8 |
| 7 | 20 |
| 8 | 46 |
| 9 | 102 |
| 10 | 220 |
| 11 | 461 |
| 12 | 948 |
| 13 | 1921 |
| 14 | 3836 |
| 15 | 7574 |
| 16 | 14810 |
| 17 | 28705 |
| 18 | 55212 |
| 19 | 105485 |
| 20 | 200300 |
| 21 | 378262 |
| 22 | 710795 |
| 23 | 1329603 |
| 24 | 2476817 |
| 25 | 4596297 |
| 26 | 8499396 |
| 27 | 15665681 |
| 28 | 28786696 |
| 29 | 52747907 |
| 30 | 96398485 |
| 31 | 175735593 |
| 32 | 319623891 |
| 33 | 580054269 |