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 | 4 |
| 3 | 144 |
| 4 | 4016 |
| 5 | 152230 |
| 6 | 14557092 |
| 7 | 1966154260 |
| 8 | 761411682704 |
| 9 | 411068703517542 |
| 10 | 684434716944151900 |
| 11 | 1572754514153890134760 |
| 12 | 11579615738168536799184984 |
| 13 | 117186519917858266359631481672 |
| 14 | 3877921919790491112398750141807648 |
| 15 | 176258463464553583688099296874564393850 |
| 16 | 26493868301658838913487471166447301509560736 |