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 | 3 |
| 3 | 21 |
| 4 | 101661 |
| 5 | 7661007 |
| 6 | 4799633969721 |
| 7 | 77198907060727563 |
| 8 | 925844015429395821936018843 |
| 9 | 42098324998788084039841633029 |
| 10 | 11083764383781783138639570812583 |
| 11 | 1490226373435897063030119543467763 |