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 | 9 |
| 3 | 111 |
| 4 | 474 |
| 5 | 969 |
| 6 | 6666 |
| 7 | 18981 |
| 8 | 67276 |
| 9 | 4411144 |
| 10 | 6964696 |
| 11 | 15444451 |
| 12 | 57966975 |
| 13 | 448707844 |
| 14 | 460595064 |
| 15 | 579696975 |
| 16 | 931929139 |
| 17 | 994040499 |
| 18 | 1227667221 |
| 19 | 9698998969 |
| 20 | 61556965516 |
| 21 | 664248842466 |
| 22 | 699030030996 |
| 23 | 99451743334715499 |