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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 10 |
| 6 | 14940 |
| 7 | 229908 |
| 8 | 1678336 |
| 9 | 8155404 |
| 10 | 30614620 |
| 11 | 96011322 |
| 12 | 263506752 |
| 13 | 652150382 |
| 14 | 1485650012 |
| 15 | 3161648520 |
| 16 | 6355083264 |
| 17 | 12167739256 |
| 18 | 22339050588 |
| 19 | 39536586430 |
| 20 | 67748508480 |
| 21 | 112804636266 |
| 22 | 183057635420 |
| 23 | 290261282204 |
| 24 | 450688785408 |
| 25 | 686540794500 |
| 26 | 1027700020828 |
| 27 | 1513897376994 |
| 28 | 2197363228480 |
| 29 | 3146046781446 |
| 30 | 4447496831580 |