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 | 45 |
| 2 | 1034 |
| 3 | 16170 |
| 4 | 193544 |
| 5 | 1890624 |
| 6 | 15695085 |
| 7 | 113852001 |
| 8 | 736452870 |
| 9 | 4313931566 |
| 10 | 23162284321 |
| 11 | 115106177245 |
| 12 | 533700057015 |
| 13 | 2324210876515 |
| 14 | 9560626910011 |
| 15 | 37327619195919 |
| 16 | 138907067703060 |
| 17 | 494486307393900 |
| 18 | 1689330735102480 |