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 | 7 |
| 3 | 19 |
| 4 | 49 |
| 5 | 130 |
| 6 | 343 |
| 7 | 907 |
| 8 | 2401 |
| 9 | 6352 |
| 10 | 16807 |
| 11 | 44467 |
| 12 | 117649 |
| 13 | 311270 |
| 14 | 823543 |
| 15 | 2178890 |
| 16 | 5764801 |
| 17 | 15252230 |
| 18 | 40353607 |
| 19 | 106765609 |
| 20 | 282475249 |
| 21 | 747359260 |
| 22 | 1977326743 |
| 23 | 5231514823 |
| 24 | 13841287201 |
| 25 | 36620603759 |