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A164640 a(n) = 8*a(n-2) for n > 2; a(1) = 1, a(2) = 6. 7
1, 6, 8, 48, 64, 384, 512, 3072, 4096, 24576, 32768, 196608, 262144, 1572864, 2097152, 12582912, 16777216, 100663296, 134217728, 805306368, 1073741824, 6442450944, 8589934592, 51539607552, 68719476736, 412316860416 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Interleaving of A001018 and A083233 without initial term 1.

Binomial transform is A164544. Third binomial transform is A038761.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..300

FORMULA

a(n) = (7-(-1)^n)*2^(1/4*(6*n -15+3*(-1)^n)).

G.f.: x*(1+6*x)/(1-8*x^2).

PROG

(MAGMA) [ n le 2 select 5*n-4 else 8*Self(n-2): n in [1..26] ];

CROSSREFS

Cf. A001018 (powers of 8), A083233 ((3*8^n+(0)^n)/4), A164544, A038761.

Sequence in context: A054102 A000380 A154153 * A223852 A192158 A167481

Adjacent sequences:  A164637 A164638 A164639 * A164641 A164642 A164643

KEYWORD

nonn,easy

AUTHOR

Klaus Brockhaus, Aug 20 2009

EXTENSIONS

G.f. corrected by Klaus Brockhaus, Sep 18 2009

STATUS

approved

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Last modified May 21 06:39 EDT 2013. Contains 225476 sequences.