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 | 21 |
| 2 | 196 |
| 3 | 1630 |
| 4 | 12776 |
| 5 | 96511 |
| 6 | 709506 |
| 7 | 5112134 |
| 8 | 36238976 |
| 9 | 253579683 |
| 10 | 1755615191 |
| 11 | 12048364111 |
| 12 | 82078204820 |
| 13 | 555669049602 |
| 14 | 3741805083510 |
| 15 | 25080702664546 |
| 16 | 167435417347772 |
| 17 | 1113826183859653 |
| 18 | 7386330575306323 |
| 19 | 48846398558444346 |