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 | 16 |
| 3 | 177 |
| 4 | 1696 |
| 5 | 14995 |
| 6 | 126180 |
| 7 | 1025707 |
| 8 | 8133544 |
| 9 | 63274143 |
| 10 | 484966972 |
| 11 | 3672258385 |
| 12 | 27533213880 |
| 13 | 204715798387 |
| 14 | 1511417062948 |
| 15 | 11090886972237 |
| 16 | 80957709527896 |
| 17 | 588206815480213 |
| 18 | 4256231985648516 |
| 19 | 30685328305245631 |
| 20 | 220504966309520728 |
| 21 | 1579874958814261407 |