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A188538 Row sums of triangle A156070. 2
1, 2, 2, 4, 6, 12, 23, 46, 90, 174, 330, 616, 1133, 2058, 3698, 6584, 11630, 20404, 35587, 61750, 106666, 183522, 314642, 537744, 916441, 1557842, 2642018, 4471276, 7552470, 12734364, 21436655, 36031486, 60478458, 101380758, 169740378, 283873144, 474246725 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 0..301

Index entries for linear recurrences with constant coefficients, signature (4,-4,-2,4,0,-1).

FORMULA

G.f.: -(2*x^4-6*x^3+2*x^2+2*x-1) / ((x-1)^2*(x^2+x-1)^2). - Colin Barker, Jul 11 2015

MAPLE

with(combinat):A188538:=proc(n) local m, s; s:=1:for m from 1 to n do s:=s+1+fibonacci(n)-fibonacci(m)-fibonacci(n-m):od; return s; end: # Nathaniel Johnston, Apr 03 2011

PROG

(PARI) Vec(-(2*x^4-6*x^3+2*x^2+2*x-1)/((x-1)^2*(x^2+x-1)^2) + O(x^50)) \\ Colin Barker, Jul 11 2015

CROSSREFS

Sequence in context: A052953 A128209 A274935 * A282164 A268175 A209025

Adjacent sequences:  A188535 A188536 A188537 * A188539 A188540 A188541

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Apr 03 2011

EXTENSIONS

Terms after a(10) from Nathaniel Johnston, Apr 03 2011

STATUS

approved

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Last modified September 18 07:50 EDT 2019. Contains 327168 sequences. (Running on oeis4.)