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 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 91 |
| 5 | 985 |
| 6 | 13201 |
| 7 | 211303 |
| 8 | 3936808 |
| 9 | 83739041 |
| 10 | 2003229469 |
| 11 | 53252096051 |
| 12 | 1557702562417 |
| 13 | 49731172316281 |
| 14 | 1720974414781454 |
| 15 | 64174041067789199 |
| 16 | 2565470565551429551 |
| 17 | 109461497917277584513 |
| 18 | 4965206236292285024041 |