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 | 4 |
| 3 | 10 |
| 4 | 24 |
| 5 | 56 |
| 6 | 136 |
| 7 | 328 |
| 8 | 784 |
| 9 | 1896 |
| 10 | 4576 |
| 11 | 11008 |
| 12 | 26592 |
| 13 | 64192 |
| 14 | 154752 |
| 15 | 373696 |
| 16 | 902144 |
| 17 | 2176640 |
| 18 | 5255424 |
| 19 | 12687488 |
| 20 | 30621952 |
| 21 | 73931392 |
| 22 | 178484736 |
| 23 | 430845952 |
| 24 | 1040176640 |
| 25 | 2511199232 |
| 26 | 6062209024 |
| 27 | 14635617280 |
| 28 | 35333443584 |
| 29 | 85300015104 |