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 | 6 |
| 4 | 92 |
| 5 | 832 |
| 6 | 4500 |
| 7 | 18229 |
| 8 | 58881 |
| 9 | 163509 |
| 10 | 401259 |
| 11 | 898420 |
| 12 | 1861146 |
| 13 | 3625546 |
| 14 | 6694982 |
| 15 | 11829267 |
| 16 | 20099815 |
| 17 | 33036079 |
| 18 | 52700901 |
| 19 | 81916834 |
| 20 | 124362664 |
| 21 | 184907220 |
| 22 | 269726216 |
| 23 | 386776561 |
| 24 | 545930397 |
| 25 | 759628777 |
| 26 | 1043027055 |
| 27 | 1414873104 |
| 28 | 1897655046 |
| 29 | 2518755934 |
| 30 | 3310591194 |