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 | 6 |
| 2 | 42 |
| 3 | 182 |
| 4 | 693 |
| 5 | 2184 |
| 6 | 6216 |
| 7 | 15912 |
| 8 | 37854 |
| 9 | 83980 |
| 10 | 176484 |
| 11 | 352716 |
| 12 | 676270 |
| 13 | 1248072 |
| 14 | 2229096 |
| 15 | 3863080 |
| 16 | 6519591 |
| 17 | 10737090 |
| 18 | 17299646 |
| 19 | 27313650 |
| 20 | 42337659 |
| 21 | 64512240 |
| 22 | 96770544 |
| 23 | 143048880 |
| 24 | 208616044 |
| 25 | 300402648 |
| 26 | 427500360 |
| 27 | 601661144 |
| 28 | 838033836 |
| 29 | 1155900720 |
| 30 | 1579738736 |