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 | 16 |
| 2 | 256 |
| 3 | 912 |
| 4 | 3130 |
| 5 | 11950 |
| 6 | 43264 |
| 7 | 157472 |
| 8 | 597090 |
| 9 | 2313118 |
| 10 | 9090370 |
| 11 | 36238920 |
| 12 | 145935334 |
| 13 | 591509888 |
| 14 | 2409192758 |
| 15 | 9847302712 |
| 16 | 40346159978 |
| 17 | 165583978038 |
| 18 | 680396239866 |
| 19 | 2798171356888 |
| 20 | 11514485951718 |
| 21 | 47402210703538 |