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 | 7 |
| 2 | 67 |
| 3 | 639 |
| 4 | 5831 |
| 5 | 49037 |
| 6 | 380939 |
| 7 | 2810751 |
| 8 | 20169871 |
| 9 | 142786013 |
| 10 | 1004527983 |
| 11 | 7047533399 |
| 12 | 49383700439 |
| 13 | 345855478109 |
| 14 | 2421574390899 |
| 15 | 16953120700735 |
| 16 | 118679602696751 |
| 17 | 830786561364589 |
| 18 | 5815618832245175 |
| 19 | 40709771502502967 |