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 | 11 |
| 2 | 55 |
| 3 | 440 |
| 4 | 3630 |
| 5 | 32208 |
| 6 | 295020 |
| 7 | 2783880 |
| 8 | 26793030 |
| 9 | 261994040 |
| 10 | 2593726344 |
| 11 | 25937424600 |
| 12 | 261535549220 |
| 13 | 2655593241840 |
| 14 | 27124986721140 |
| 15 | 278483211283552 |
| 16 | 2871858103075830 |
| 17 | 29732178147017280 |