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 | 0 |
| 1 | 8 |
| 2 | 112 |
| 3 | 1304 |
| 4 | 14560 |
| 5 | 160808 |
| 6 | 1770832 |
| 7 | 19484984 |
| 8 | 214352320 |
| 9 | 2357928008 |
| 10 | 25937365552 |
| 11 | 285311493464 |
| 12 | 3138427845280 |
| 13 | 34522710549608 |
| 14 | 379749828800272 |
| 15 | 4177248155066744 |
| 16 | 45949729820525440 |
| 17 | 505447028370153608 |
| 18 | 5559917313104810992 |
| 19 | 61159090447252284824 |
| 20 | 672749994929073224800 |