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) |
|---|---|
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 8 |
| 7 | 13 |
| 8 | 24 |
| 9 | 40 |
| 10 | 71 |
| 11 | 119 |
| 12 | 216 |
| 13 | 372 |
| 14 | 678 |
| 15 | 1215 |
| 16 | 2240 |
| 17 | 4102 |
| 18 | 7674 |
| 19 | 14299 |
| 20 | 27000 |
| 21 | 50952 |
| 22 | 96896 |
| 23 | 184397 |
| 24 | 352684 |
| 25 | 675174 |
| 26 | 1296843 |
| 27 | 2493711 |
| 28 | 4806062 |
| 29 | 9272764 |
| 30 | 17920843 |
| 31 | 34669585 |
| 32 | 67159032 |
| 33 | 130216106 |
| 34 | 252745349 |
| 35 | 490984469 |
| 36 | 954637538 |
| 37 | 1857545280 |
| 38 | 3617214660 |
| 39 | 7048675939 |
| 40 | 13744694906 |