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 | 0 |
| 1 | 16 |
| 2 | 48 |
| 3 | 101 |
| 4 | 421 |
| 5 | 2374 |
| 6 | 7728 |
| 7 | 9449 |
| 8 | 17685 |
| 9 | 83666 |
| 10 | 71168 |
| 11 | 128130 |
| 12 | 555251 |
| 13 | 412816 |
| 14 | 271385 |
| 15 | 1111695 |
| 16 | 1910101 |
| 17 | 11633401 |
| 18 | 14851698 |
| 19 | 9668058 |
| 20 | 43227391 |
| 21 | 159078942 |