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 A164532 a(n) = 6*a(n-2) for n > 2; a(1) = 1, a(2) = 4. 3
 1, 4, 6, 24, 36, 144, 216, 864, 1296, 5184, 7776, 31104, 46656, 186624, 279936, 1119744, 1679616, 6718464, 10077696, 40310784, 60466176, 241864704, 362797056, 1451188224, 2176782336, 8707129344, 13060694016, 52242776064, 78364164096 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Interleaving of A000400 and A067411 without initial term 1. Binomial transform is apparently A123011. Fourth binomial transform is A154235. LINKS FORMULA a(n) = (5-(-1)^n)*6^(1/4*(2*n-5+(-1)^n)). G.f.: x*(1+4*x)/(1-6*x^2). a(n+3) = a(n+2)*a(n+1)/a(n). [Reinhard Zumkeller, Mar 04 2011] PROG (MAGMA) [ n le 2 select 3*n-2 else 6*Self(n-2): n in [1..29] ]; CROSSREFS Cf. A000400 (powers of 6), A067411, A123011, A154235. Sequence in context: A087784 A174197 A071224 * A098660 A122174 A034458 Adjacent sequences:  A164529 A164530 A164531 * A164533 A164534 A164535 KEYWORD nonn AUTHOR Klaus Brockhaus, Aug 15 2009 STATUS approved

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