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 | 1 |
| 2 | 89 |
| 3 | 571 |
| 4 | 18061 |
| 5 | 185921 |
| 6 | 4213133 |
| 7 | 53175517 |
| 8 | 1031151241 |
| 9 | 14479521761 |
| 10 | 258584046368 |
| 11 | 3852472573499 |
| 12 | 65743732590821 |
| 13 | 1012747193318519 |
| 14 | 16848161392724969 |
| 15 | 264499788583572499 |
| 16 | 4337452956682508609 |
| 17 | 68829675768134027209 |
| 18 | 1119577238373960926141 |