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 | 1 |
| 2 | 616 |
| 3 | 16389 |
| 4 | 223995 |
| 5 | 6623719 |
| 6 | 200646607 |
| 7 | 4893232934 |
| 8 | 123820581049 |
| 9 | 3282367305458 |
| 10 | 85515734535996 |
| 11 | 2212616825808470 |
| 12 | 57500163901287398 |
| 13 | 1495338053514246125 |
| 14 | 38856248352062385594 |
| 15 | 1009626165673776079481 |