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 | 81 |
| 3 | 1353 |
| 4 | 3997 |
| 5 | 7723 |
| 6 | 23761 |
| 7 | 26271 |
| 8 | 76771 |
| 9 | 1415683 |
| 10 | 3890571 |
| 11 | 8495497 |
| 12 | 1066870443 |
| 13 | 1239366513 |
| 14 | 4198438981 |
| 15 | 4534273891 |
| 16 | 6502317141 |
| 17 | 6918679731 |
| 18 | 2199164200036329043 |
| 19 | 2820114781174460091 |
| 20 | 5500888421709400741 |