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) |
|---|---|
| 49 | 1 |
| 50 | 50 |
| 51 | 1275 |
| 52 | 22100 |
| 53 | 292825 |
| 54 | 3162510 |
| 55 | 28989675 |
| 56 | 231917400 |
| 57 | 1652411475 |
| 58 | 10648873950 |
| 59 | 62828356305 |
| 60 | 342700125300 |
| 61 | 1742058970275 |
| 62 | 8308281242850 |
| 63 | 37387265592825 |
| 64 | 159518999862720 |
| 65 | 648045936942300 |
| 66 | 2515943049305400 |