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 A219861 Number of ways to dissect a nonsquare rectangle into n rectangles of equal area up to symmetry. 2
 1, 2, 4, 11, 35, 130, 562, 2685, 13901, 76046 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE There are 4 ways (up to symmetry) to form a nonsquare rectangle from 3 rectangles with the same area: +-----+ +-+-+-+ +-----+ +-+---+ |     | | | | | |     | | |   | +-----+ | | | | +--+--+ | |   | |     | | | | | |  |  | | +---+ +-----+ | | | | |  |  | | |   | |     | | | | | |  |  | | |   | +-----+ +-+-+-+ +--+--+ +-+---+ So a(3)=4. The eleven solutions for n=4 can be seen as a subset of the illustration of A189243(4) = 21 in that entry. - N. J. A. Sloane, Dec 05 2012 CROSSREFS Cf. A108066, A189243. Sequence in context: A186998 A243788 A245465 * A193058 A179379 A086611 Adjacent sequences:  A219858 A219859 A219860 * A219862 A219863 A219864 KEYWORD nonn,more AUTHOR Geoffrey H. Morley, Nov 29 2012 EXTENSIONS a(7)-a(10) from Geoffrey H. Morley, Dec 16 2012 STATUS approved

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Last modified June 19 23:01 EDT 2019. Contains 324222 sequences. (Running on oeis4.)