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 | 8 |
| 2 | 72 |
| 3 | 528 |
| 4 | 3582 |
| 5 | 22512 |
| 6 | 134040 |
| 7 | 760896 |
| 8 | 4152852 |
| 9 | 21897408 |
| 10 | 112037852 |
| 11 | 558049096 |
| 12 | 2713386758 |
| 13 | 12907891432 |
| 14 | 60190937724 |
| 15 | 275575683576 |
| 16 | 1240483837374 |
| 17 | 5496780654912 |
| 18 | 24002417723284 |
| 19 | 103380586347376 |
| 20 | 439565299059250 |
| 21 | 1846430027348704 |
| 22 | 7667597264015436 |