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 | 12 |
| 2 | 506 |
| 3 | 37037 |
| 4 | 3834009 |
| 5 | 512501792 |
| 6 | 83914215402 |
| 7 | 16258109291002 |
| 8 | 3637416562713075 |
| 9 | 922786228220640101 |
| 10 | 261741863272493596614 |
| 11 | 82078032321730681299097 |
| 12 | 28195269239973685901676782 |
| 13 | 10529425953839699619063326836 |