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) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 34 |
| 4 | 78 |
| 5 | 166 |
| 6 | 342 |
| 7 | 694 |
| 8 | 1398 |
| 9 | 2806 |
| 10 | 5622 |
| 11 | 11254 |
| 12 | 22518 |
| 13 | 45046 |
| 14 | 90102 |
| 15 | 180214 |
| 16 | 360438 |
| 17 | 720886 |
| 18 | 1441782 |
| 19 | 2883574 |
| 20 | 5767158 |
| 21 | 11534326 |
| 22 | 23068662 |
| 23 | 46137334 |
| 24 | 92274678 |
| 25 | 184549366 |
| 26 | 369098742 |
| 27 | 738197494 |
| 28 | 1476394998 |
| 29 | 2952790006 |
| 30 | 5905580022 |
| 31 | 11811160054 |