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 | 536 |
| 3 | 1428 |
| 4 | 17092 |
| 5 | 100894 |
| 6 | 753200 |
| 7 | 4652710 |
| 8 | 29364176 |
| 9 | 177955614 |
| 10 | 1080135428 |
| 11 | 6499878776 |
| 12 | 39104150100 |
| 13 | 234816782208 |
| 14 | 1409805025568 |
| 15 | 8460732943882 |
| 16 | 50772490924064 |
| 17 | 304654183120186 |
| 18 | 1828001400070884 |
| 19 | 10968208935015636 |