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 | 13 |
| 4 | 32 |
| 5 | 76 |
| 6 | 176 |
| 7 | 400 |
| 8 | 896 |
| 9 | 1984 |
| 10 | 4352 |
| 11 | 9472 |
| 12 | 20480 |
| 13 | 44032 |
| 14 | 94208 |
| 15 | 200704 |
| 16 | 425984 |
| 17 | 901120 |
| 18 | 1900544 |
| 19 | 3997696 |
| 20 | 8388608 |
| 21 | 17563648 |
| 22 | 36700160 |
| 23 | 76546048 |
| 24 | 159383552 |
| 25 | 331350016 |
| 26 | 687865856 |
| 27 | 1426063360 |
| 28 | 2952790016 |
| 29 | 6106906624 |