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 A164683 a(n) = 8*a(n-2) for n > 2; a(1) = 1, a(2) = 8. 5
 1, 8, 8, 64, 64, 512, 512, 4096, 4096, 32768, 32768, 262144, 262144, 2097152, 2097152, 16777216, 16777216, 134217728, 134217728, 1073741824, 1073741824, 8589934592, 8589934592, 68719476736, 68719476736, 549755813888 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Interleaving of A001018 and A001018 without initial term 1. Binomial transform is A083100. Second binomial transform is A164607. LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..300 FORMULA a(n) = 2^(1/4*(6*n-3+3*(-1)^n)). G.f.: x*(1+8*x)/(1-8*x^2). MATHEMATICA With[{c=8^Range[0, 15]}, Riffle[c, c]]//Rest (* Harvey P. Dale, Aug 08 2017 *) PROG (MAGMA) [ n le 2 select 7*n-6 else 8*Self(n-2): n in [1..26] ]; CROSSREFS Cf. A001018 (powers of 8), A083100, A164607. Sequence in context: A103744 A151782 A165829 * A222957 A038286 A245133 Adjacent sequences:  A164680 A164681 A164682 * A164684 A164685 A164686 KEYWORD nonn,easy AUTHOR Klaus Brockhaus, Aug 22 2009 STATUS approved

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Last modified June 18 23:16 EDT 2021. Contains 345125 sequences. (Running on oeis4.)