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 | 5 |
| 3 | 41 |
| 4 | 465 |
| 5 | 6721 |
| 6 | 117941 |
| 7 | 2433145 |
| 8 | 57673281 |
| 9 | 1543866945 |
| 10 | 46052954821 |
| 11 | 1514472783561 |
| 12 | 54426342354385 |
| 13 | 2121878761891201 |
| 14 | 89187219264121525 |
| 15 | 4020175011403931801 |
| 16 | 193438800635132796161 |
| 17 | 9895634072548245693825 |
| 18 | 536284759396849853348101 |
| 19 | 30691678336547328623916905 |