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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 183 |
| 4 | 1641 |
| 5 | 14763 |
| 6 | 132861 |
| 7 | 1195743 |
| 8 | 10761681 |
| 9 | 96855123 |
| 10 | 871696101 |
| 11 | 7845264903 |
| 12 | 70607384121 |
| 13 | 635466457083 |
| 14 | 5719198113741 |
| 15 | 51472783023663 |
| 16 | 463255047212961 |
| 17 | 4169295424916643 |
| 18 | 37523658824249781 |
| 19 | 337712929418248023 |
| 20 | 3039416364764232201 |
| 21 | 27354747282878089803 |
| 22 | 246192725545902808221 |