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 A176710 Mix A001021, 2*A001021. 0
 1, 2, 12, 24, 144, 288, 1728, 3456, 20736, 41472, 248832, 497664, 2985984, 5971968, 35831808, 71663616, 429981696, 859963392, 5159780352, 10319560704, 61917364224 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Divides A091137. See A165313. LINKS Index entries for linear recurrences with constant coefficients, signature (0,12). FORMULA a(n)= +12*a(n-2). G.f.: ( -1-2*x ) / ( -1+12*x^2 ). [From R. J. Mathar, Apr 26 2010] a(n)=(1/12)*[3-1*(-1)^n]*{12^(1/2)*n*12^[(1/4)*(-1)^n]*108^(1/4)}, with n>=0 [From Paolo P. Lava, May 21 2010] CROSSREFS Sequence in context: A121119 A226899 A052565 * A141900 A211374 A126962 Adjacent sequences:  A176707 A176708 A176709 * A176711 A176712 A176713 KEYWORD nonn,easy AUTHOR Paul Curtz, Apr 24 2010 STATUS approved

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Last modified April 18 06:48 EDT 2019. Contains 322209 sequences. (Running on oeis4.)