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 | 7 |
| 2 | 23 |
| 3 | 159 |
| 4 | 895 |
| 5 | 22527 |
| 6 | 106495 |
| 7 | 2228223 |
| 8 | 9961471 |
| 9 | 192937983 |
| 10 | 15569256447 |
| 11 | 66571993087 |
| 12 | 5085241278463 |
| 13 | 90159953477631 |
| 14 | 378231999954943 |
| 15 | 6614661952700415 |
| 16 | 477381560501272575 |
| 17 | 34011184385901985791 |