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 | 7 |
| 3 | 77 |
| 4 | 1946 |
| 5 | 84754 |
| 6 | 6202524 |
| 7 | 636369348 |
| 8 | 89979720144 |
| 9 | 16431405256656 |
| 10 | 3796658174518560 |
| 11 | 1077102230236529760 |
| 12 | 368915006390671969920 |
| 13 | 149873555740938949215360 |
| 14 | 71297150722148582901815040 |
| 15 | 39244301012876892023553235200 |