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 | 10 |
| 2 | 170 |
| 3 | 2730 |
| 4 | 43690 |
| 5 | 699050 |
| 6 | 11184810 |
| 7 | 178956970 |
| 8 | 2863311530 |
| 9 | 45812984490 |
| 10 | 733007751850 |
| 11 | 11728124029610 |
| 12 | 187649984473770 |
| 13 | 3002399751580330 |
| 14 | 48038396025285290 |
| 15 | 768614336404564650 |
| 16 | 12297829382473034410 |
| 17 | 196765270119568550570 |
| 18 | 3148244321913096809130 |