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A032090 "BHK" (reversible, identity, unlabeled) transform of 0,1,1,1... 1
0, 1, 1, 1, 2, 2, 4, 5, 10, 14, 26, 39, 69, 107, 183, 289, 484, 772, 1276, 2047, 3356, 5402, 8812, 14213, 23113, 37325, 60581, 97905, 158718, 256622, 415716, 672337, 1088662, 1760998, 2850646, 4611643, 7463885, 12075527 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

C. G. Bower, Transforms (2)

Index to sequences with linear recurrences with constant coefficients, signature (2,1,-3,1,-1,0,1).

FORMULA

G.f.: -x^2*(x^6+x^5-x^4+2*x^3-2*x^2-x+1) / ((x-1)*(x^2+x-1)*(x^4+x^2-1)). [Colin Barker, Dec 07 2012]

MATHEMATICA

CoefficientList[Series[- x (x^6 + x^5 - x^4 + 2 x^3 - 2 x^2 - x + 1)/((x - 1) (x^2 + x - 1) (x^4 + x^2 - 1)), {x, 0, 40}], x] (* Vincenzo Librandi, Oct 19 2013 *)

CROSSREFS

For n>2, a(n) = A032089(n-1) + [n even], a(2n) = A032097(n-1).

Sequence in context: A222006 A127712 A178113 * A000014 A114851 A099364

Adjacent sequences:  A032087 A032088 A032089 * A032091 A032092 A032093

KEYWORD

nonn,easy

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified April 18 03:24 EDT 2014. Contains 240688 sequences.