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 | 36 |
| 3 | 176 |
| 4 | 1044 |
| 5 | 6560 |
| 6 | 43800 |
| 7 | 299600 |
| 8 | 2097684 |
| 9 | 14913200 |
| 10 | 107377488 |
| 11 | 780903152 |
| 12 | 5726645688 |
| 13 | 42288908768 |
| 14 | 314146329192 |
| 15 | 2345624810432 |
| 16 | 17592187093524 |
| 17 | 132458812569728 |
| 18 | 1000799924679192 |
| 19 | 7585009898729264 |
| 20 | 57646075284033552 |
| 21 | 439208192231379680 |