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 | 1 |
| 3 | 5 |
| 4 | 38 |
| 5 | 471 |
| 6 | 10661 |
| 7 | 450923 |
| 8 | 35863932 |
| 9 | 5353011030 |
| 10 | 1500957421749 |
| 11 | 790347882174803 |
| 12 | 781621363452395224 |
| 13 | 1451740730942350766747 |
| 14 | 5064070747064013555843107 |
| 15 | 33176273260130056822126522407 |