This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .