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) |
|---|---|
| 0 | 1 |
| 1 | 23 |
| 2 | 310 |
| 3 | 3195 |
| 4 | 27866 |
| 5 | 216566 |
| 6 | 1546028 |
| 7 | 10338515 |
| 8 | 65635570 |
| 9 | 399429602 |
| 10 | 2346750900 |
| 11 | 13384232030 |
| 12 | 74417751940 |
| 13 | 404759481420 |
| 14 | 2159510136408 |
| 15 | 11327603405955 |
| 16 | 58528412321250 |
| 17 | 298354368109930 |
| 18 | 1502525977613540 |