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 | 6 |
| 2 | 6 |
| 3 | 30 |
| 4 | 78 |
| 5 | 1134 |
| 6 | 1350 |
| 7 | 20574 |
| 8 | 23238 |
| 9 | 390606 |
| 10 | 496998 |
| 11 | 7614750 |
| 12 | 10987926 |
| 13 | 152120934 |
| 14 | 237122526 |
| 15 | 3110708214 |
| 16 | 5017927638 |
| 17 | 64718847438 |
| 18 | 105210653478 |
| 19 | 1362453235998 |