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 | 2 |
| 1 | 3 |
| 2 | 113 |
| 3 | 1637 |
| 4 | 2971 |
| 5 | 44293 |
| 6 | 305663 |
| 7 | 1133071 |
| 8 | 370261 |
| 9 | 1357201 |
| 10 | 46006769 |
| 11 | 268119517 |
| 12 | 291057379 |
| 13 | 3429782117 |
| 14 | 10502593103 |
| 15 | 10926444583 |
| 16 | 87241770619 |
| 17 | 226751019497 |
| 18 | 1901687257447 |