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 | 2 |
| 2 | 5 |
| 3 | 10 |
| 4 | 22 |
| 5 | 44 |
| 6 | 92 |
| 7 | 184 |
| 8 | 376 |
| 9 | 752 |
| 10 | 1520 |
| 11 | 3040 |
| 12 | 6112 |
| 13 | 12224 |
| 14 | 24512 |
| 15 | 49024 |
| 16 | 98176 |
| 17 | 196352 |
| 18 | 392960 |
| 19 | 785920 |
| 20 | 1572352 |
| 21 | 3144704 |
| 22 | 6290432 |
| 23 | 12580864 |
| 24 | 25163776 |
| 25 | 50327552 |
| 26 | 100659200 |
| 27 | 201318400 |
| 28 | 402644992 |
| 29 | 805289984 |
| 30 | 1610596352 |
| 31 | 3221192704 |