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 | 2 |
| 2 | 12 |
| 3 | 71 |
| 4 | 430 |
| 5 | 2652 |
| 6 | 16576 |
| 7 | 104652 |
| 8 | 665874 |
| 9 | 4263050 |
| 10 | 27430260 |
| 11 | 177233355 |
| 12 | 1149159336 |
| 13 | 7473264736 |
| 14 | 48725661120 |
| 15 | 318403991656 |
| 16 | 2084753927898 |
| 17 | 13673789668854 |
| 18 | 89825336129620 |
| 19 | 590901795716925 |
| 20 | 3892055708986830 |
| 21 | 25664871706721940 |
| 22 | 169414775012098560 |
| 23 | 1119378775384200240 |
| 24 | 7402571891557073400 |
| 25 | 48993463632294517752 |
| 26 | 324501821324483687856 |