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 | 8 |
| 4 | 30 |
| 5 | 118 |
| 6 | 548 |
| 7 | 2790 |
| 8 | 16029 |
| 9 | 101353 |
| 10 | 706572 |
| 11 | 5375249 |
| 12 | 44402094 |
| 13 | 395734706 |
| 14 | 3786401086 |
| 15 | 38711834576 |
| 16 | 421217184135 |
| 17 | 4860174299186 |
| 18 | 59278045511959 |
| 19 | 762055884150141 |
| 20 | 10299293881159294 |
| 21 | 145994591873294780 |
| 22 | 2165938721141964179 |
| 23 | 33564939201581495090 |
| 24 | 542344644703485899950 |
| 25 | 9122110321170144880053 |