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 | 26 |
| 2 | 124 |
| 3 | 1400 |
| 4 | 10000 |
| 5 | 89504 |
| 6 | 707008 |
| 7 | 5924480 |
| 8 | 47900416 |
| 9 | 393069824 |
| 10 | 3189761536 |
| 11 | 25963397888 |
| 12 | 210468531712 |
| 13 | 1706090904320 |
| 14 | 13803141607936 |
| 15 | 111595408530176 |
| 16 | 901164713600512 |
| 17 | 7271581998320384 |
| 18 | 58625571435837952 |
| 19 | 472335388734974720 |
| 20 | 3803021424555945472 |
| 21 | 30602681612309510912 |
| 22 | 246127842107210007040 |