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 | 32 |
| 2 | 640 |
| 3 | 10240 |
| 4 | 143360 |
| 5 | 1835008 |
| 6 | 22020096 |
| 7 | 251658240 |
| 8 | 2768240640 |
| 9 | 29527900160 |
| 10 | 307090161664 |
| 11 | 3126736191488 |
| 12 | 31267361914880 |
| 13 | 307863255777280 |
| 14 | 2990671627550720 |
| 15 | 28710447624486912 |
| 16 | 272749252432625664 |
| 17 | 2567051787601182720 |
| 18 | 23959150017611038720 |