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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 20 |
| 5 | 45 |
| 6 | 102 |
| 7 | 233 |
| 8 | 535 |
| 9 | 1234 |
| 10 | 2857 |
| 11 | 6636 |
| 12 | 15456 |
| 13 | 36085 |
| 14 | 84424 |
| 15 | 197883 |
| 16 | 464585 |
| 17 | 1092348 |
| 18 | 2571770 |
| 19 | 6062109 |
| 20 | 14305022 |
| 21 | 33789777 |
| 22 | 79887365 |
| 23 | 189031914 |
| 24 | 447639473 |
| 25 | 1060798484 |
| 26 | 2515512091 |
| 27 | 5968826698 |
| 28 | 14171068794 |
| 29 | 33662866431 |
| 30 | 80005478832 |
| 31 | 190237068767 |
| 32 | 452548530595 |