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) |
|---|---|
| 2 | 2 |
| 3 | 9 |
| 4 | 22 |
| 5 | 125 |
| 6 | 137 |
| 7 | 343 |
| 8 | 726 |
| 9 | 6849 |
| 10 | 7129 |
| 11 | 81191 |
| 12 | 83711 |
| 13 | 1118273 |
| 14 | 1145993 |
| 15 | 1171733 |
| 16 | 2391514 |
| 17 | 41421503 |
| 18 | 42142223 |
| 19 | 271211719 |
| 20 | 275295799 |
| 21 | 55835135 |
| 22 | 18858053 |
| 23 | 439143531 |
| 24 | 1332950097 |
| 25 | 33695573875 |
| 26 | 34052522467 |
| 27 | 309561680403 |
| 28 | 312536252003 |
| 29 | 9146733078187 |
| 30 | 9227046511387 |