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) |
|---|---|
| 61 | 1 |
| 62 | 62 |
| 63 | 1953 |
| 64 | 41664 |
| 65 | 677040 |
| 66 | 8936928 |
| 67 | 99795696 |
| 68 | 969443904 |
| 69 | 8361453672 |
| 70 | 65033528560 |
| 71 | 461738052776 |
| 72 | 3022285436352 |
| 73 | 18385569737808 |
| 74 | 104656320045984 |
| 75 | 560658857389200 |
| 76 | 2840671544105280 |
| 77 | 13670731806006660 |