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 A226980 Number of ways to cut an n X n square into squares with integer sides, reduced for symmetry, where the orbits under the symmetry group of the square, D4, have 4 elements. 8
 0, 0, 1, 6, 26, 264, 1157, 23460, 153485, 6748424, 70521609, 6791578258 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS Christopher Hunt Gribble, C++ program for A226978, A226979, A226980, A226981, A227004 Ed Wynn, Exhaustive generation of Mrs Perkins's quilt square dissections for low orders, arXiv:1308.5420 FORMULA A226978(n) + A226979(n) + A226980(n) + A226981(n) = A224239(n). 1*A226978(n) + 2*A226979(n) + 4*A226980(n) + 8*A226981(n) = A045846(n). A226980(n) = A240123(n) + A240124(n) + A240125(n). EXAMPLE For n=5, there are 26 dissections where the orbits under the symmetry group of the square, D4, have 4 elements. The 6 dissections for n=4 can be seen in A240123 and A240125. CROSSREFS Cf. A045846, A034295, A219924, A224239, A226978, A226979, A226981, A240123, A240124, A240125. Sequence in context: A027283 A009639 A323868 * A199591 A230867 A137088 Adjacent sequences:  A226977 A226978 A226979 * A226981 A226982 A226983 KEYWORD nonn,more AUTHOR Christopher Hunt Gribble, Jun 25 2013 EXTENSIONS a(8)-a(12) from Ed Wynn, Apr 01 2014 STATUS approved

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Last modified July 23 21:10 EDT 2021. Contains 346265 sequences. (Running on oeis4.)