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 | 0 |
| 5 | 5 |
| 6 | 21 |
| 7 | 63 |
| 8 | 162 |
| 9 | 381 |
| 10 | 847 |
| 11 | 1815 |
| 12 | 3796 |
| 13 | 7813 |
| 14 | 15913 |
| 15 | 32191 |
| 16 | 64838 |
| 17 | 130237 |
| 18 | 261155 |
| 19 | 523127 |
| 20 | 1047224 |
| 21 | 2095589 |
| 22 | 4192509 |
| 23 | 8386559 |
| 24 | 16774890 |
| 25 | 33551805 |
| 26 | 67105911 |
| 27 | 134214423 |
| 28 | 268431772 |
| 29 | 536866821 |
| 30 | 1073737297 |
| 31 | 2147478655 |
| 32 | 4294961806 |
| 33 | 8589928573 |
| 34 | 17179862603 |