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 | 1 |
| 4 | 3 |
| 5 | 5 |
| 6 | 29 |
| 7 | 152 |
| 8 | 136 |
| 9 | 2016 |
| 10 | 10959 |
| 11 | 26840 |
| 12 | 1056437 |
| 13 | 2495955 |
| 14 | 16311831 |
| 15 | 102287808 |
| 16 | 1627690024 |
| 17 | 10021808981 |
| 18 | 25377192720 |
| 19 | 1085424779823 |
| 20 | 2681584376185 |
| 21 | 17876295136009 |
| 22 | 113220181313816 |
| 23 | 1933742696582736 |