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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 34 |
| 5 | 80 |
| 6 | 204 |
| 7 | 448 |
| 8 | 1072 |
| 9 | 2308 |
| 10 | 5280 |
| 11 | 11264 |
| 12 | 25088 |
| 13 | 53248 |
| 14 | 116032 |
| 15 | 245920 |
| 16 | 527880 |
| 17 | 1114112 |
| 18 | 2369152 |
| 19 | 4980736 |
| 20 | 10508880 |
| 21 | 22022336 |
| 22 | 46193664 |
| 23 | 96468992 |
| 24 | 201469408 |
| 25 | 419430416 |
| 26 | 872734720 |
| 27 | 1811960832 |
| 28 | 3758844096 |
| 29 | 7784628224 |
| 30 | 16107909312 |
| 31 | 33285996544 |
| 32 | 68723417856 |
| 33 | 141734089728 |