The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221840 Number of sets of n squares providing dissections of a square. 1
 1, 0, 0, 1, 0, 1, 1, 2, 4, 7 (list; graph; refs; listen; history; text; internal format)
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 24 17:05 EST 2024. Contains 370307 sequences. (Running on oeis4.)