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) |
|---|---|
| 2 | 28 |
| 3 | 1664 |
| 4 | 114069 |
| 5 | 5948291 |
| 6 | 279285399 |
| 7 | 12947640143 |
| 8 | 603841648931 |
| 9 | 28251882697663 |
| 10 | 1322310119854705 |
| 11 | 61875355046353061 |
| 12 | 2895006802805407868 |
| 13 | 135448608195945754204 |
| 14 | 6337277838067727854392 |
| 15 | 296505504331623399871908 |
| 16 | 13872765058478362509835979 |
| 17 | 649072483984291902586660423 |