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

1,10

Links

Table of n, a(n) for n=1..30.

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.

Crossrefs

Equals A000577 - A070765. Cf. A001419, A038144.

Sequence in context: A042651 A225692 A359524 * A327646 A244746 A110051

Adjacent sequences: A070761 A070762 A070763 * A070765 A070766 A070767

Keyword

hard,nonn

Author

Joseph Myers, May 05 2002

Extensions

More terms from Joseph Myers, Nov 11 2003

a(29)-a(30) from Joseph Myers, Nov 21 2010

Status

approved