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 | 1 |
| 1 | 18 |
| 2 | 306 |
| 3 | 5202 |
| 4 | 88146 |
| 5 | 1493874 |
| 6 | 25300530 |
| 7 | 428518386 |
| 8 | 7256300850 |
| 9 | 122876680626 |
| 10 | 2080586127186 |
| 11 | 35229409431570 |
| 12 | 596495353475538 |
| 13 | 10099744526658546 |
| 14 | 171003188767881906 |
| 15 | 2895335387107970706 |
| 16 | 49021668492861718674 |
| 17 | 829999403731225961874 |