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) |
|---|---|
| 16 | 1 |
| 17 | 12 |
| 18 | 106 |
| 19 | 677 |
| 20 | 3494 |
| 21 | 15072 |
| 22 | 56687 |
| 23 | 189836 |
| 24 | 578105 |
| 25 | 1621690 |
| 26 | 4241828 |
| 27 | 10434473 |
| 28 | 24323694 |
| 29 | 54053172 |
| 30 | 115100757 |
| 31 | 235866109 |
| 32 | 466850629 |
| 33 | 895363599 |
| 34 | 1668452274 |
| 35 | 3028132617 |
| 36 | 5364010992 |
| 37 | 9291348726 |
| 38 | 15763537852 |
| 39 | 26234025046 |
| 40 | 42882816586 |
| 41 | 68933785785 |
| 42 | 109087903602 |