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 | 2 |
| 4 | 2 |
| 5 | 4 |
| 6 | 8 |
| 7 | 12 |
| 8 | 22 |
| 9 | 40 |
| 10 | 80 |
| 11 | 140 |
| 12 | 272 |
| 13 | 504 |
| 14 | 1008 |
| 15 | 1860 |
| 16 | 3698 |
| 17 | 6948 |
| 18 | 13896 |
| 19 | 26196 |
| 20 | 52312 |
| 21 | 99416 |
| 22 | 198832 |
| 23 | 379316 |
| 24 | 758360 |
| 25 | 1453312 |
| 26 | 2906624 |
| 27 | 5587704 |
| 28 | 11174400 |
| 29 | 21546672 |
| 30 | 43093344 |
| 31 | 83295796 |
| 32 | 166587894 |
| 33 | 322712680 |
| 34 | 645425360 |
| 35 | 1252691124 |
| 36 | 2505368352 |
| 37 | 4870919800 |