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 A178176 a(n) is the number of central quotients of simple compact Lie groups of dimension n 1
 0, 0, 2, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 1, 3, 0, 0, 0, 0, 0, 4, 0, 0, 2, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 2, 0, 0, 0, 1, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS EXAMPLE a(3) = 2 since the 3-dimensional SU(2) has two central quotients: SU(2) and SU(2)/2 = SO(3). The unusually large value a(78) = 6 is due to the simple Lie groups Spin(13), Sp(6), and E_6 each of dimension 78 and each having two central quotients. CROSSREFS Sequence in context: A171919 A000089 A051907 * A093569 A073091 A125250 Adjacent sequences:  A178173 A178174 A178175 * A178177 A178178 A178179 KEYWORD nonn AUTHOR Andrew Rupinski, Dec 18 2010 STATUS approved

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Last modified December 18 09:25 EST 2018. Contains 318219 sequences. (Running on oeis4.)