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 | 3 |
| 2 | 8 |
| 3 | 25 |
| 4 | 91 |
| 5 | 376 |
| 6 | 1715 |
| 7 | 8471 |
| 8 | 44838 |
| 9 | 252903 |
| 10 | 1514213 |
| 11 | 9590874 |
| 12 | 64056173 |
| 13 | 449804453 |
| 14 | 3312346950 |
| 15 | 25521479277 |
| 16 | 205300781275 |
| 17 | 1720450321356 |
| 18 | 14986361037495 |
| 19 | 135393159641569 |
| 20 | 1266006310597506 |
| 21 | 12228936468908781 |
| 22 | 121823473948915769 |
| 23 | 1249794986354577736 |