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 | 0 |
| 6 | 10596 |
| 7 | 486668 |
| 8 | 7063520 |
| 9 | 55345356 |
| 10 | 299491100 |
| 11 | 1263811604 |
| 12 | 4455716184 |
| 13 | 13701863604 |
| 14 | 37823872044 |
| 15 | 95648273100 |
| 16 | 224887404416 |
| 17 | 497181121100 |
| 18 | 1042609380588 |
| 19 | 2088337713332 |
| 20 | 4017815773400 |
| 21 | 7459198321428 |
| 22 | 13414493857116 |
| 23 | 23444476061772 |
| 24 | 39928736913120 |
| 25 | 66425550447500 |
| 26 | 108162598959740 |
| 27 | 172697249542932 |
| 28 | 270794133842456 |
| 29 | 417578468928308 |
| 30 | 634036069773900 |