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 | 10 |
| 2 | 121 |
| 3 | 1690 |
| 4 | 25921 |
| 5 | 420250 |
| 6 | 7027801 |
| 7 | 119508490 |
| 8 | 2050368961 |
| 9 | 35341836010 |
| 10 | 610665665401 |
| 11 | 10564982353210 |
| 12 | 182902930753921 |
| 13 | 3167536046903290 |
| 14 | 54865571909148121 |
| 15 | 950426408617182250 |
| 16 | 16464857882672822401 |
| 17 | 285238628280432626890 |
| 18 | 4941562979309619843961 |