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 | 20 |
| 3 | 225 |
| 4 | 1925 |
| 5 | 14014 |
| 6 | 91728 |
| 7 | 556920 |
| 8 | 3197700 |
| 9 | 17587350 |
| 10 | 93486536 |
| 11 | 483367885 |
| 12 | 2442687975 |
| 13 | 12109051500 |
| 14 | 59053512000 |
| 15 | 283963030560 |
| 16 | 1348824395160 |
| 17 | 6338392712550 |
| 18 | 29503515951000 |
| 19 | 136173391604250 |