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 | 6 |
| 2 | 10 |
| 3 | 84 |
| 4 | 186 |
| 5 | 1276 |
| 6 | 3172 |
| 7 | 19816 |
| 8 | 52666 |
| 9 | 310764 |
| 10 | 863820 |
| 11 | 4899736 |
| 12 | 14073060 |
| 13 | 77509464 |
| 14 | 228318856 |
| 15 | 1228859344 |
| 16 | 3693886906 |
| 17 | 19513475404 |
| 18 | 59644341436 |
| 19 | 310223170744 |
| 20 | 961665098956 |
| 21 | 4936304385544 |
| 22 | 15488087080696 |
| 23 | 78602174905264 |
| 24 | 249227373027556 |
| 25 | 1252310513280376 |
| 26 | 4007681094422392 |
| 27 | 19961337935130096 |
| 28 | 64408903437167496 |
| 29 | 318297642651252784 |
| 30 | 1034656923041985552 |