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 | 3 |
| 3 | 5 |
| 4 | 34 |
| 5 | 29 |
| 6 | 1626 |
| 7 | 727 |
| 8 | 99128 |
| 9 | 584649 |
| 10 | 12353050 |
| 11 | 3628811 |
| 12 | 4648976652 |
| 13 | 479001613 |
| 14 | 803709466574 |
| 15 | 11133394272015 |
| 16 | 391883024332816 |
| 17 | 20922789888017 |
| 18 | 312756670075449618 |
| 19 | 6402373705728019 |
| 20 | 148614866400768768020 |
| 21 | 2663970255433783296021 |