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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 July 6 23:01 EDT 2020. Contains 335484 sequences. (Running on oeis4.)