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 | 0 |
| 1 | 1 |
| 2 | 28 |
| 3 | 325 |
| 4 | 3160 |
| 5 | 29161 |
| 6 | 264628 |
| 7 | 2388205 |
| 8 | 21513520 |
| 9 | 193680721 |
| 10 | 1743303628 |
| 11 | 15690264085 |
| 12 | 141213971080 |
| 13 | 1270930522681 |
| 14 | 11438389053028 |
| 15 | 102945544523965 |
| 16 | 926510029855840 |
| 17 | 8338590656123041 |
| 18 | 75047317067368828 |