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) |
|---|---|
| 3 | 426 |
| 4 | 4968 |
| 5 | 50640 |
| 6 | 486930 |
| 7 | 4547088 |
| 8 | 41796168 |
| 9 | 380789562 |
| 10 | 3451622904 |
| 11 | 31194607488 |
| 12 | 281440825122 |
| 13 | 2536622917920 |
| 14 | 22848990484344 |
| 15 | 205743704494026 |
| 16 | 1852238413383048 |
| 17 | 16673036119790640 |
| 18 | 150072652217086770 |
| 19 | 1350735146332489008 |
| 20 | 12157047307392618408 |