A057418 Number of n-celled polyominoes with 1 hole.
1, 6, 37, 195, 975, 4622, 21128, 94109, 410820, 1766591, 7506179, 31596240, 131991619, 547992183, 2263477612, 9309386178, 38150082057, 155859235424, 635067478628, 2581737704039
Offset: 7
Keywords
Links
- Tomás Oliveira e Silva, Enumeration of polyominoes