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 | 6 |
| 2 | 84 |
| 3 | 882 |
| 4 | 8232 |
| 5 | 72030 |
| 6 | 605052 |
| 7 | 4941258 |
| 8 | 39530064 |
| 9 | 311299254 |
| 10 | 2421216420 |
| 11 | 18643366434 |
| 12 | 142367525496 |
| 13 | 1079620401678 |
| 14 | 8138676874188 |
| 15 | 61040076556410 |
| 16 | 455765904954528 |
| 17 | 3389758918099302 |
| 18 | 25124095510618356 |
| 19 | 185639150161791186 |
| 20 | 1367867422244777160 |
| 21 | 10053825553499112126 |