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 | 2 |
| 3 | 3 |
| 4 | 12 |
| 5 | 25 |
| 6 | 66 |
| 7 | 147 |
| 8 | 344 |
| 9 | 765 |
| 10 | 1710 |
| 11 | 3751 |
| 12 | 8196 |
| 13 | 17745 |
| 14 | 38234 |
| 15 | 81915 |
| 16 | 174768 |
| 17 | 371365 |
| 18 | 786438 |
| 19 | 1660239 |
| 20 | 3495260 |
| 21 | 7340025 |
| 22 | 15379122 |
| 23 | 32156323 |
| 24 | 67108872 |
| 25 | 139810125 |
| 26 | 290805086 |
| 27 | 603979767 |
| 28 | 1252698804 |
| 29 | 2594876065 |
| 30 | 5368709130 |
| 31 | 11095332171 |
| 32 | 22906492256 |