A213860 Number of free poly-IH22-tiles (holes allowed) with n cells.

1, 3, 8, 30, 106, 413, 1616, 6525, 26588, 109900, 457964, 1924270, 8135692, 34592460, 147780810

Offset

1,2

References

Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.

Links

Table of n, a(n) for n=1..15.

Crossrefs

Sequence in context: A221537 A148888 A151440 * A360991 A361135 A348662

Adjacent sequences: A213857 A213858 A213859 * A213861 A213862 A213863

Keyword

hard,more,nonn

Author

Joseph Myers, Jun 26 2012

Status

approved