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 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 113 |
| 5 | 1526 |
| 6 | 24337 |
| 7 | 450066 |
| 8 | 9492289 |
| 9 | 225159022 |
| 10 | 5937424601 |
| 11 | 172385029466 |
| 12 | 5465884225969 |
| 13 | 187964560069638 |
| 14 | 6968912374274593 |
| 15 | 277133723845128226 |
| 16 | 11767703728247765249 |
| 17 | 531431035966023003614 |
| 18 | 25434534147318166381993 |
| 19 | 1286040688679372821752042 |