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 | 0 |
| 2 | 25 |
| 3 | 1348 |
| 4 | 30772 |
| 5 | 449677 |
| 6 | 4950399 |
| 7 | 44571591 |
| 8 | 344302564 |
| 9 | 2353207764 |
| 10 | 14536481606 |
| 11 | 82424606803 |
| 12 | 434031398793 |
| 13 | 2141802790067 |
| 14 | 9975624305928 |
| 15 | 44106878749240 |
| 16 | 186005545087412 |
| 17 | 751100286992318 |
| 18 | 2913746151722174 |