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 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 21 |
| 5 | 43 |
| 6 | 88 |
| 7 | 177 |
| 8 | 356 |
| 9 | 714 |
| 10 | 1429 |
| 11 | 2860 |
| 12 | 5722 |
| 13 | 11445 |
| 14 | 22891 |
| 15 | 45784 |
| 16 | 91569 |
| 17 | 183139 |
| 18 | 366280 |
| 19 | 732562 |
| 20 | 1465125 |
| 21 | 2930252 |
| 22 | 5860505 |
| 23 | 11721011 |
| 24 | 23442024 |
| 25 | 46884049 |
| 26 | 93768100 |
| 27 | 187536202 |
| 28 | 375072405 |
| 29 | 750144811 |
| 30 | 1500289624 |
| 31 | 3000579249 |
| 32 | 6001158499 |
| 33 | 12002317000 |