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 | 1 |
| 2 | 3 |
| 3 | 51 |
| 4 | 3614 |
| 5 | 991930 |
| 6 | 1051469032 |
| 7 | 4366988803688 |
| 8 | 71895397383029040 |
| 9 | 4719082081411731363408 |
| 10 | 1237678715644664931691596416 |
| 11 | 1297992266840866792981316221144960 |
| 12 | 5444416466164313011147841248189209354496 |
| 13 | 91343356480627224177654291875698256656613808896 |