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 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 99 |
| 4 | 297 |
| 5 | 891 |
| 6 | 1683 |
| 7 | 8019 |
| 8 | 5049 |
| 9 | 17325 |
| 10 | 15147 |
| 11 | 99225 |
| 12 | 31977 |
| 13 | 190575 |
| 14 | 136323 |
| 15 | 121275 |
| 16 | 95931 |
| 17 | 3189375 |
| 18 | 225225 |
| 19 | 64304361 |
| 20 | 287793 |
| 21 | 1289925 |
| 22 | 1686825 |
| 23 | 15526875 |
| 24 | 675675 |
| 25 | 1091475 |
| 26 | 3239775 |
| 27 | 1576575 |
| 28 | 2590137 |
| 29 | 251644717004571 |
| 30 | 2027025 |
| 31 | 15436575 |
| 32 | 2297295 |
| 33 | 28676025 |
| 34 | 33350625 |
| 35 | 9823275 |
| 36 | 3828825 |
| 37 | 42879375 |
| 38 | 760816875 |