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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 29 |
| 6 | 69 |
| 7 | 165 |
| 8 | 393 |
| 9 | 937 |
| 10 | 2233 |
| 11 | 5322 |
| 12 | 12683 |
| 13 | 30227 |
| 14 | 72037 |
| 15 | 171680 |
| 16 | 409151 |
| 17 | 975097 |
| 18 | 2323870 |
| 19 | 5538294 |
| 20 | 13198973 |
| 21 | 31456058 |
| 22 | 74966710 |
| 23 | 178662171 |
| 24 | 425791279 |
| 25 | 1014754341 |
| 26 | 2418382956 |
| 27 | 5763538903 |
| 28 | 13735781840 |
| 29 | 32735391558 |
| 30 | 78015643589 |