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 | 128 |
| 1 | 270 |
| 2 | 910 |
| 3 | 4392 |
| 4 | 26218 |
| 5 | 177120 |
| 6 | 1292410 |
| 7 | 9924912 |
| 8 | 78974938 |
| 9 | 644749920 |
| 10 | 5365004410 |
| 11 | 45294444432 |
| 12 | 386724933658 |
| 13 | 3331246259520 |
| 14 | 28899114836410 |
| 15 | 252142576067952 |
| 16 | 2210222303020378 |
| 17 | 19448976596389920 |
| 18 | 171690169932572410 |
| 19 | 1519690359242075472 |
| 20 | 13481625657159443098 |