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 | 1 |
| 3 | 4 |
| 4 | 10 |
| 5 | 24 |
| 6 | 50 |
| 7 | 108 |
| 8 | 220 |
| 9 | 452 |
| 10 | 916 |
| 11 | 1860 |
| 12 | 3744 |
| 13 | 7560 |
| 14 | 15202 |
| 15 | 30576 |
| 16 | 61420 |
| 17 | 123360 |
| 18 | 247542 |
| 19 | 496692 |
| 20 | 996088 |
| 21 | 1997272 |
| 22 | 4003558 |
| 23 | 8023884 |
| 24 | 16077964 |
| 25 | 32212248 |
| 26 | 64527436 |
| 27 | 129246660 |
| 28 | 258847876 |
| 29 | 518358120 |
| 30 | 1037949256 |
| 31 | 2078209980 |
| 32 | 4160747500 |
| 33 | 8329633416 |
| 34 | 16674575056 |
| 35 | 33378031536 |