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 | 3 |
| 3 | 33 |
| 4 | 91 |
| 5 | 989 |
| 6 | 2727 |
| 7 | 29637 |
| 8 | 81719 |
| 9 | 888121 |
| 10 | 2448843 |
| 11 | 26613993 |
| 12 | 73383571 |
| 13 | 797531669 |
| 14 | 2199058287 |
| 15 | 23899336077 |
| 16 | 65898365039 |
| 17 | 716182550641 |
| 18 | 1974751892883 |
| 19 | 21461577183153 |
| 20 | 59176658421451 |
| 21 | 643131132943949 |
| 22 | 1773325000750647 |
| 23 | 19272472411135317 |
| 24 | 53140573364097959 |