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 | 4 |
| 3 | 12 |
| 4 | 100 |
| 5 | 1085 |
| 6 | 1218 |
| 7 | 47201 |
| 8 | 556088 |
| 9 | 10659753 |
| 10 | 7281020 |
| 11 | 62927202701 |
| 12 | 7217988 |
| 13 | 60718623181177 |
| 14 | 595952851172 |
| 15 | 13324959230295 |
| 16 | 247016251998448 |
| 17 | 28505095507110827053 |
| 18 | 549689328228186 |
| 19 | 320305941258100632731917 |