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 | 4 |
| 2 | 16 |
| 3 | 56 |
| 4 | 176 |
| 5 | 512 |
| 6 | 1408 |
| 7 | 3712 |
| 8 | 9472 |
| 9 | 23552 |
| 10 | 57344 |
| 11 | 137216 |
| 12 | 323584 |
| 13 | 753664 |
| 14 | 1736704 |
| 15 | 3964928 |
| 16 | 8978432 |
| 17 | 20185088 |
| 18 | 45088768 |
| 19 | 100139008 |
| 20 | 221249536 |
| 21 | 486539264 |
| 22 | 1065353216 |
| 23 | 2323644416 |
| 24 | 5049942016 |
| 25 | 10938744832 |
| 26 | 23622320128 |
| 27 | 50868518912 |
| 28 | 109253230592 |
| 29 | 234075717632 |