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 | 24 |
| 3 | 182 |
| 4 | 1636 |
| 5 | 16844 |
| 6 | 194384 |
| 7 | 2476868 |
| 8 | 34461956 |
| 9 | 519070980 |
| 10 | 8405444924 |
| 11 | 145502477888 |
| 12 | 2679656009072 |
| 13 | 52289220500822 |
| 14 | 1077289873778412 |
| 15 | 23361106832257087 |
| 16 | 531744673834247758 |
| 17 | 12673569230875132668 |