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 | 1 |
| 2 | 5 |
| 3 | 64 |
| 4 | 1613 |
| 5 | 69026 |
| 6 | 4566992 |
| 7 | 437665649 |
| 8 | 57903766797 |
| 9 | 10193400044254 |
| 10 | 2319001344297830 |
| 11 | 665816738235745559 |
| 12 | 236563125351122920088 |
| 13 | 102303284135845463907107 |
| 14 | 53093636013475924370369829 |
| 15 | 32666276100771741793923209939 |
| 16 | 23573762287735885858839134983437 |