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 | 2 |
| 1 | 18 |
| 2 | 290 |
| 3 | 4914 |
| 4 | 83522 |
| 5 | 1419858 |
| 6 | 24137570 |
| 7 | 410338674 |
| 8 | 6975757442 |
| 9 | 118587876498 |
| 10 | 2015993900450 |
| 11 | 34271896307634 |
| 12 | 582622237229762 |
| 13 | 9904578032905938 |
| 14 | 168377826559400930 |
| 15 | 2862423051509815794 |
| 16 | 48661191875666868482 |
| 17 | 827240261886336764178 |
| 18 | 14063084452067724991010 |