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 | 8 |
| 3 | 38 |
| 4 | 184 |
| 5 | 976 |
| 6 | 5382 |
| 7 | 29739 |
| 8 | 163496 |
| 9 | 896476 |
| 10 | 4913258 |
| 11 | 26932712 |
| 12 | 147657866 |
| 13 | 809563548 |
| 14 | 4438573234 |
| 15 | 24335048679 |
| 16 | 133419610132 |
| 17 | 731487691902 |
| 18 | 4010463268476 |
| 19 | 21987818897998 |
| 20 | 120550710615560 |
| 21 | 660932932108467 |