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 | 5 |
| 2 | 13 |
| 3 | 35 |
| 4 | 79 |
| 5 | 185 |
| 6 | 397 |
| 7 | 875 |
| 8 | 1831 |
| 9 | 3905 |
| 10 | 8053 |
| 11 | 16835 |
| 12 | 34399 |
| 13 | 70985 |
| 14 | 144157 |
| 15 | 294875 |
| 16 | 596311 |
| 17 | 1212305 |
| 18 | 2444293 |
| 19 | 4947635 |
| 20 | 9954319 |
| 21 | 20085785 |
| 22 | 40348717 |
| 23 | 81228875 |
| 24 | 162989191 |
| 25 | 327572705 |
| 26 | 656739733 |
| 27 | 1318262435 |
| 28 | 2641307839 |
| 29 | 5296964585 |
| 30 | 10608278077 |
| 31 | 21259602875 |