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 | 19 |
| 2 | 361 |
| 3 | 1575 |
| 4 | 6418 |
| 5 | 22322 |
| 6 | 65094 |
| 7 | 185613 |
| 8 | 486006 |
| 9 | 1224264 |
| 10 | 2997835 |
| 11 | 7098270 |
| 12 | 16550130 |
| 13 | 37910398 |
| 14 | 85814196 |
| 15 | 192716626 |
| 16 | 429872932 |
| 17 | 955654852 |
| 18 | 2120317621 |
| 19 | 4702504577 |
| 20 | 10440375393 |
| 21 | 23222416590 |
| 22 | 51793064829 |
| 23 | 115881126227 |