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) |
|---|---|
| 54 | 1 |
| 55 | 55 |
| 56 | 1540 |
| 57 | 29260 |
| 58 | 424270 |
| 59 | 5006386 |
| 60 | 50063860 |
| 61 | 436270780 |
| 62 | 3381098545 |
| 63 | 23667689815 |
| 64 | 151473214816 |
| 65 | 895068996640 |
| 66 | 4922879481520 |
| 67 | 25371763481680 |
| 68 | 123234279768160 |
| 69 | 566877686933536 |
| 70 | 2480089880334220 |
| 71 | 10358022441395860 |