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A338415
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Triangle read by rows: T(n,m) = C(n+m+1,n)*C(2*n-m,n)*C(3*n+1,n)*C(4*n+2,2*m+1)/(2*(n+1)*C(2*n,n)*C(2*n+2*m+2,2*n)).
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0
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1, 2, 2, 7, 18, 7, 30, 130, 130, 30, 143, 884, 1530, 884, 143, 728, 5880, 14896, 14896, 5880, 728, 3876, 38760, 131100, 193200, 131100, 38760, 3876, 21318, 254562, 1085238, 2153250, 2153250, 1085238, 254562, 21318, 120175, 1669800, 8627300, 21755800, 29370330, 21755800, 8627300, 1669800, 120175
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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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G.f. satisfies A(x,y)=x/(A(x,y)^2*y^2-2*A(x,y)^2*y-2*A(x,y)*y+A(x,y)^2-2*A(x,y)+1).
A(x,y) = ((x*(27*y^4-108*y^3+162*y^2+(-108)*y+27)-2*y^3+66*y^2+66*y-2)/(54*y^6-324*y^5+810*y^4+(-1080)*y^3+810*y^2+(-324)*y+54)+sqrt(27*x^2*y^4+((-108)*x^2-4*x)*y^3+(162*x^2+132*x)*y^2+((-108)*x^2+132*x-16)*y+27*x^2+(-4)*x)/(2*3^(3/2)*(y-1)^4))^(1/3)+(y^2+14*y+1)/((9*y^4-36*y^3+54*y^2+(-36)*y+9)*((x*(27*y^4-108*y^3+162*y^2+(-108)*y+27)-2*y^3+66*y^2+66*y-2)/(54*y^6-324*y^5+810*y^4+(-1080)*y^3+810*y^2+(-324)*y+54)+sqrt(27*x^2*y^4+((-108)*x^2-4*x)*y^3+(162*x^2+132*x)*y^2+((-108)*x^2+132*x-16)*y+27*x^2+(-4)*x)/(2*3^(3/2)*(y-1)^4))^(1/3))+(2*y+2)/(3*(y^2-2*y+1)).
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EXAMPLE
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1,
2, 2,
7, 18, 7,
30, 130, 130, 30,
143, 884, 1530, 884, 143
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PROG
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(Maxima)
A(x, y) := ((x*(27*y^4-108*y^3+162*y^2+(-108)*y+27)-2*y^3+66*y^2+66*y-2)/(54*y^6-324*y^5+810*y^4+(-1080)*y^3+810*y^2+(-324)*y+54)+sqrt(27*x^2*y^4+((-108)*x^2-4*x)*y^3+(162*x^2+132*x)*y^2+((-108)*x^2+132*x-16)*y+27*x^2+(-4)*x)/(2*3^(3/2)*(y-1)^4))^(1/3)+(y^2+14*y+1)/((9*y^4-36*y^3+54*y^2+(-36)*y+9)*((x*(27*y^4-108*y^3+162*y^2+(-108)*y+27)-2*y^3+66*y^2+66*y-2)/(54*y^6-324*y^5+810*y^4+(-1080)*y^3+810*y^2+(-324)*y+54)+sqrt(27*x^2*y^4+((-108)*x^2-4*x)*y^3+(162*x^2+132*x)*y^2+((-108)*x^2+132*x-16)*y+27*x^2+(-4)*x)/(2*3^(3/2)*(y-1)^4))^(1/3))+(2*y+2)/(3*(y^2-2*y+1));
taylor(A(x, y), x, 0, 7, y, 0, 7);
(Maxima)
T(n, m):=(binomial(n+m+1, n)*binomial(2*n-m, n)*binomial(3*n+1, n)* binomial(4*n+2, 2*m+1))/((2*n+2)*binomial(2*n, n)*binomial(2*n+2*m+2, 2*n));
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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