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 | 3 |
| 2 | 10 |
| 3 | 126 |
| 4 | 2402 |
| 5 | 161052 |
| 6 | 4826810 |
| 7 | 410338674 |
| 8 | 16983563042 |
| 9 | 1801152661464 |
| 10 | 420707233300202 |
| 11 | 25408476896404832 |
| 12 | 6582952005840035282 |
| 13 | 925103102315013629322 |
| 14 | 73885357344138503765450 |
| 15 | 12063348350820368238715344 |
| 16 | 3876269050118516845397872322 |