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 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 22 |
| 6 | 83 |
| 7 | 316 |
| 8 | 1213 |
| 9 | 4667 |
| 10 | 17992 |
| 11 | 69509 |
| 12 | 269058 |
| 13 | 1043346 |
| 14 | 4052518 |
| 15 | 15764358 |
| 16 | 61408219 |
| 17 | 239510633 |
| 18 | 935245088 |
| 19 | 3655841616 |
| 20 | 14304538696 |
| 21 | 56021145629 |
| 22 | 219579741115 |
| 23 | 861327333405 |
| 24 | 3381084681442 |
| 25 | 13281106066320 |