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 | 2 |
| 4 | 4 |
| 5 | 12 |
| 6 | 23 |
| 7 | 53 |
| 8 | 104 |
| 9 | 218 |
| 10 | 437 |
| 11 | 893 |
| 12 | 1785 |
| 13 | 3620 |
| 14 | 7264 |
| 15 | 14634 |
| 16 | 29382 |
| 17 | 59097 |
| 18 | 118617 |
| 19 | 238291 |
| 20 | 478191 |
| 21 | 959867 |
| 22 | 1925681 |
| 23 | 3863365 |
| 24 | 7748136 |
| 25 | 15538461 |
| 26 | 31154278 |
| 27 | 62458007 |
| 28 | 125194936 |
| 29 | 250924636 |
| 30 | 502855774 |
| 31 | 1007635332 |
| 32 | 2018912085 |
| 33 | 4044775367 |
| 34 | 8102759211 |
| 35 | 16230735448 |
| 36 | 32509514412 |
| 37 | 65110826347 |