A221840 Number of sets of n squares providing dissections of a square.

1, 0, 0, 1, 0, 1, 1, 2, 4, 7

Offset

1,8

Comments

It seems that a(11) = 16 and a(12) = 30. [Vladimir Letsko, Sep 17 2013]

Links

Table of n, a(n) for n=1..10.

Mathematical Marathon, Problem 152 (in Russian)

Example

a(8) = 2 as there are two sets of 8 squares which tile a unit square, namely {1(0.75X0.75), 7(0.25X0.25)} and {1(0.6X0.6), 3(0.4X0.4), 4(0.2X0.2)}.

Crossrefs

Cf. A221841, A005670.

Sequence in context: A090315 A083753 A170807 * A111512 A283509 A111768

Adjacent sequences: A221837 A221838 A221839 * A221841 A221842 A221843

Keyword

nonn,more

Author

Geoffrey H. Morley, Jan 26 2013

Extensions

a(10) corrected by Geoffrey H. Morley, Aug 02 2013

Status

approved