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 | 12 |
| 2 | 144 |
| 3 | 857 |
| 4 | 4008 |
| 5 | 20662 |
| 6 | 120839 |
| 7 | 708519 |
| 8 | 3984317 |
| 9 | 22096751 |
| 10 | 123685638 |
| 11 | 697749740 |
| 12 | 3933600940 |
| 13 | 22113174257 |
| 14 | 124226310961 |
| 15 | 698384857435 |
| 16 | 3928070328882 |
| 17 | 22091307667400 |
| 18 | 124217141507585 |
| 19 | 698440667872786 |