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 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 69 |
| 5 | 626 |
| 6 | 7812 |
| 7 | 117650 |
| 8 | 2097425 |
| 9 | 43046803 |
| 10 | 1000003158 |
| 11 | 25937424602 |
| 12 | 743008418676 |
| 13 | 23298085122482 |
| 14 | 793714774077816 |
| 15 | 29192926025406980 |
| 16 | 1152921504623628545 |
| 17 | 48661191875666868482 |
| 18 | 2185911559739084235093 |
| 19 | 104127350297911241532842 |