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 | 37 |
| 1 | 77 |
| 2 | 170 |
| 3 | 714 |
| 4 | 3450 |
| 5 | 10414 |
| 6 | 68145 |
| 7 | 303610 |
| 8 | 721305 |
| 9 | 1815066 |
| 10 | 17782782 |
| 11 | 4598150 |
| 12 | 68178460 |
| 13 | 133118649 |
| 14 | 585506070 |
| 15 | 20663527908 |
| 16 | 777507763200 |
| 17 | 264506067126 |
| 18 | 73112062114130 |
| 19 | 5907184479605316 |
| 20 | 516068243814152148 |