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 | 2 |
| 3 | 8 |
| 4 | 41 |
| 5 | 249 |
| 6 | 1754 |
| 7 | 14084 |
| 8 | 127057 |
| 9 | 1272625 |
| 10 | 14015014 |
| 11 | 168323364 |
| 12 | 2189619553 |
| 13 | 30670104577 |
| 14 | 460235322854 |
| 15 | 7366138539416 |
| 16 | 125257398648401 |
| 17 | 2255126454472401 |
| 18 | 42855262052316218 |
| 19 | 857238357862313360 |