This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A131130 Binomial transform of [1,1,7,1,7,1,7,1,...]. 7
 1, 2, 10, 26, 58, 122, 250, 506, 1018, 2042, 4090, 8186, 16378, 32762, 65530, 131066, 262138, 524282, 1048570, 2097146, 4194298, 8388602, 16777210, 33554426, 67108858, 134217722, 268435450, 536870906, 1073741818, 2147483642 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS A095121 = binomial transform of [1, 1, 3, 1, 3, 1, 3, 1,...]. A131128 = binomial transform of [1, 1, 5, 1, 5, 1, 5, 1,...]. LINKS Index to sequences with linear recurrences with constant coefficients, signature (3,-2). FORMULA Row sums of triangle A131131. a(n)=4*2^n - 6 for n>=1; a(0)=1. a(n)=3*a(n-1)-2*a(n-2), n>2 ; a(0)=1, a(1)=2, a(2)=10 . G.f.: (1-x+6x^2)/(1-3x+2x^2). [Philippe DELEHAM, Jan 04 2009] a(n)=2*a(n-1)+6 for n>1, a(0)=1, a(1)=2. [Philippe DELEHAM, Sep 25 2009] MAPLE 1, seq(4*2^n-6, n = 1 .. 30); MATHEMATICA a=2; lst={1, a}; k=8; Do[a+=k; AppendTo[lst, a]; k+=k, {n, 0, 5!}]; lst [Vladimir Joseph Stephan Orlovsky, Dec 16 2008] CROSSREFS Cf. A131131, A131128, A095121. Sequence in context: A045605 A212969 A009307 * A099969 A183331 A025589 Adjacent sequences:  A131127 A131128 A131129 * A131131 A131132 A131133 KEYWORD nonn,easy AUTHOR Gary W. Adamson, Jun 16 2007 EXTENSIONS Edited by Emeric Deutsch, Jul 12 2007 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 .

Last modified May 22 09:43 EDT 2013. Contains 225519 sequences.