A221840 - OEIS

%I #22 Sep 20 2013 04:21:37

%S 1,0,0,1,0,1,1,2,4,7

%N Number of sets of n squares providing dissections of a square.

%C It seems that a(11) = 16 and a(12) = 30. [_Vladimir Letsko_, Sep 17 2013]

%H <a href="http://www-old.fizmat.vspu.ru/doku.php?id=marathon:problem_152"> Mathematical Marathon, Problem 152</a> (in Russian)

%e 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)}.

%Y Cf. A221841, A005670.

%K nonn,more

%O 1,8

%A _Geoffrey H. Morley_, Jan 26 2013

%E a(10) corrected by _Geoffrey H. Morley_, Aug 02 2013