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1, 2, 8, 40, 212, 1152, 6360, 35520, 200132, 1135456, 6478088, 37128896, 213617704, 1233014720, 7136819376, 41408161920, 240758343684, 1402436532576, 8182797500328, 47814708577728, 279768031296312, 1638915078384960, 9611453035886160
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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The offset is chosen following the Deleham offset in A124576, not according to the less systematic offset in the definition.
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LINKS
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FORMULA
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Conjecture: 3*n*a(n) +2*(-13*n+9)*a(n-1) +4*(13*n-21)*a(n-2) +24*(-n+2)*a(n-3)=0.
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MAPLE
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AA := proc(n, k, x, y)
option remember;
if k <0 or k > n then
0 ;
elif n = 0 then
1;
elif k = 0 then
x*procname(n-1, k, x, y)+procname(n-1, 1, x, y) ;
else
procname(n-1, k-1, x, y)+y*procname(n-1, k, x, y)+procname(n-1, k+1, x, y) ;
end if;
end proc:
seq(add( AA(n, k, 1, 4), k=0..n), n=0..30) ;
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MATHEMATICA
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CoefficientList[Series[1/(6*x-1+2*Sqrt[(2*x-1)*(6*x-1)]), {x, 0, 30}], x] (* Vaclav Kotesovec, Jul 06 2013 *)
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PROG
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(PARI) x='x+O('x^30); Vec(1/(6*x -1 +2*sqrt((2*x-1)*(6*x-1)))) \\ G. C. Greubel, Nov 19 2018
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); Coefficients(R!( 1/(6*x -1 +2*Sqrt((2*x-1)*(6*x-1))) )); // G. C. Greubel, Nov 19 2018
(Sage) s= (1/(6*x -1 +2*sqrt((2*x-1)*(6*x-1)))).series(x, 30); s.coefficients(x, sparse=False) # G. C. Greubel, Nov 19 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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