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 A060689 Number of non-Abelian groups of order n. 10
 0, 0, 0, 0, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 9, 0, 3, 0, 3, 1, 1, 0, 12, 0, 1, 2, 2, 0, 3, 0, 44, 0, 1, 0, 10, 0, 1, 1, 11, 0, 5, 0, 2, 0, 1, 0, 47, 0, 3, 0, 3, 0, 12, 1, 10, 1, 1, 0, 11, 0, 1, 2, 256, 0, 3, 0, 3, 0, 3, 0, 44, 0, 1, 1, 2, 0, 5, 0, 47, 10, 1, 0, 13, 0, 1, 0, 9, 0, 8, 0, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,8 COMMENTS a(n) = 0 iff n belongs to sequence A051532. LINKS T. D. Noe, Table of n, a(n) for n=1..2015 FORMULA a(n) = A000001(n) - A000688(n). EXAMPLE a(6) = 1 because the only non-Abelian group of order 6 is the symmetric group S_3. MATHEMATICA Table[FiniteGroupCount[n]-FiniteAbelianGroupCount[n], {n, 6!}] (* Vladimir Joseph Stephan Orlovsky, Feb 12 2010 *) CROSSREFS Cf. A000001, A000688. Sequence in context: A272216 A225345 A083280 * A053119 A162515 A175267 Adjacent sequences:  A060686 A060687 A060688 * A060690 A060691 A060692 KEYWORD nonn AUTHOR Ahmed Fares (ahmedfares(AT)my-deja.com), Apr 19 2001 EXTENSIONS Corrected by Avi Peretz (njk(AT)netvision.net.il), Apr 21 2001 STATUS approved

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