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 | 11 |
| 4 | 24 |
| 5 | 52 |
| 6 | 112 |
| 7 | 240 |
| 8 | 512 |
| 9 | 1088 |
| 10 | 2304 |
| 11 | 4864 |
| 12 | 10240 |
| 13 | 21504 |
| 14 | 45056 |
| 15 | 94208 |
| 16 | 196608 |
| 17 | 409600 |
| 18 | 851968 |
| 19 | 1769472 |
| 20 | 3670016 |
| 21 | 7602176 |
| 22 | 15728640 |
| 23 | 32505856 |
| 24 | 67108864 |
| 25 | 138412032 |
| 26 | 285212672 |
| 27 | 587202560 |
| 28 | 1207959552 |
| 29 | 2483027968 |
| 30 | 5100273664 |