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 | 16 |
| 3 | 128 |
| 4 | 1156 |
| 5 | 10952 |
| 6 | 107584 |
| 7 | 1083392 |
| 8 | 11115556 |
| 9 | 115702472 |
| 10 | 1218289216 |
| 11 | 12948910592 |
| 12 | 138708574096 |
| 13 | 1495661223968 |
| 14 | 16218468710656 |
| 15 | 176727219273728 |
| 16 | 1933956651447076 |
| 17 | 21243204576601928 |
| 18 | 234121111199439424 |
| 19 | 2587943032046002688 |