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 | 7 |
| 3 | 41 |
| 4 | 235 |
| 5 | 1361 |
| 6 | 7987 |
| 7 | 47321 |
| 8 | 281995 |
| 9 | 1685921 |
| 10 | 10096867 |
| 11 | 60524201 |
| 12 | 362972155 |
| 13 | 2177309681 |
| 14 | 13062280147 |
| 15 | 78368930681 |
| 16 | 470199300715 |
| 17 | 2821152888641 |
| 18 | 16926788453827 |
| 19 | 101560343826761 |
| 20 | 609360901747675 |
| 21 | 3656161925798801 |
| 22 | 21936961098633907 |
| 23 | 131621735219132441 |