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) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 68 |
| 3 | 1092 |
| 4 | 17476 |
| 5 | 279620 |
| 6 | 4473924 |
| 7 | 71582788 |
| 8 | 1145324612 |
| 9 | 18325193796 |
| 10 | 293203100740 |
| 11 | 4691249611844 |
| 12 | 75059993789508 |
| 13 | 1200959900632132 |
| 14 | 19215358410114116 |
| 15 | 307445734561825860 |
| 16 | 4919131752989213764 |
| 17 | 78706108047827420228 |
| 18 | 1259297728765238723652 |