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) |
|---|---|
| 1 | 5 |
| 2 | 130 |
| 3 | 8500 |
| 4 | 1051076 |
| 5 | 211255200 |
| 6 | 62840245000 |
| 7 | 25959932960000 |
| 8 | 14224928867370000 |
| 9 | 9986120745657472000 |
| 10 | 8740787543400204500000 |
| 11 | 9333385482079885824000000 |
| 12 | 11942338721669302523305000000 |
| 13 | 18038821394494464638896640000000 |