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 | 34 |
| 4 | 142 |
| 5 | 547 |
| 6 | 2005 |
| 7 | 7108 |
| 8 | 24604 |
| 9 | 83653 |
| 10 | 280483 |
| 11 | 930022 |
| 12 | 3055786 |
| 13 | 9964519 |
| 14 | 32285041 |
| 15 | 104029576 |
| 16 | 333612088 |
| 17 | 1065406345 |
| 18 | 3389929279 |
| 19 | 10750918570 |
| 20 | 33996147910 |
| 21 | 107218620331 |
| 22 | 337346390797 |
| 23 | 1059110761804 |
| 24 | 3318547053652 |
| 25 | 10379285465677 |
| 26 | 32408789311195 |
| 27 | 101039166676078 |