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A038225
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Top line of 4-wave sequence A038197, also bisection of A006357.
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0
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1, 4, 30, 246, 2037, 16886, 139997, 1160693, 9623140, 79784098, 661478734, 5484227157, 45468956106, 376976720745, 3125460977225, 25912757426660, 214839027697334, 1781200165693270, 14767680082482085, 122436758775876478
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OFFSET
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0,2
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LINKS
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FORMULA
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Let v(4) = (1, 1, 1, 1), let M(4) be the 4 X 4 matrix m(i, j) = min(i, j); then a(n) = min(v(4)*M(4)^n). - Benoit Cloitre, Oct 03 2002
G.f.: ( 1-6*x+5*x^2-x^3 ) / ( (x-1)*(x^3-6*x^2+9*x-1) ). - Wouter Meeussen, Mar 19 2005
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PROG
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(PARI) k=4; M(k)=matrix(k, k, i, j, min(i, j)); v(k)=vector(k, i, 1); a(n)=vecmin(v(k)*M(k)^n)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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