A070764 Number of polyiamonds with n cells, with holes.
0, 0, 0, 0, 0, 0, 0, 0, 1, 4, 25, 108, 450, 1713, 6267, 21988, 75185, 251590, 828408, 2692630, 8661287, 27624040, 87479663, 275392248, 862593661, 2690285608, 8359581585, 25893044920, 79978118632, 246433568617
Offset: 1
Links
- Craig Knecht, Enneiamond with a hole - positions in a triangle.
- Craig Knecht, Hexagon tiling.
- Craig Knecht, Most equal distribution using the polyiamonds with holes.
- Craig Knecht, Newton's Cradle.
- Craig Knecht, Polyiamond 12-gon.
- Craig Knecht, Tilings with fixed triangles in a frame.
Extensions
More terms from Joseph Myers, Nov 11 2003
a(29)-a(30) from Joseph Myers, Nov 21 2010