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 | 6 |
| 3 | 22 |
| 4 | 64 |
| 5 | 164 |
| 6 | 392 |
| 7 | 904 |
| 8 | 2048 |
| 9 | 4592 |
| 10 | 10208 |
| 11 | 22496 |
| 12 | 49152 |
| 13 | 106560 |
| 14 | 229504 |
| 15 | 491648 |
| 16 | 1048576 |
| 17 | 2227968 |
| 18 | 4718080 |
| 19 | 9960960 |
| 20 | 20971520 |
| 21 | 44041216 |
| 22 | 92276736 |
| 23 | 192940032 |
| 24 | 402653184 |
| 25 | 838856704 |
| 26 | 1744822272 |
| 27 | 3623870464 |
| 28 | 7516192768 |