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A368012
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a(n) is the permanent of the n-th order Hankel matrix of Catalan numbers M(n) whose generic element is given by M(i,j) = A000108(i+j) with i,j = 0, ..., n-1.
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7
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1, 1, 3, 95, 38057, 207372681, 15977248385955, 17828166968924572623, 292842668371666277607183121, 71645110588632775032727941092738473, 263399284865064400938403105805219201386749363, 14653009564320804036813733761485114583670416021283903839, 12403293423772370760211339634714413308535752478944832963336911564521
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OFFSET
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0,3
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LINKS
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FORMULA
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Det(M(n)) = 1 (see Mays and Wojciechowski, 2000).
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EXAMPLE
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a(4) = 38057:
1, 1, 2, 5;
1, 2, 5, 14;
2, 5, 14, 42;
5, 14, 42, 132.
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MATHEMATICA
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Join[{1}, Table[Permanent[Table[CatalanNumber[i+j], {i, 0, n-1}, {j, 0, n-1}]], {n, 12}]]
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PROG
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(PARI) C(n) = binomial(2*n, n)/(n+1); \\ A000108
a(n) = matpermanent(matrix(n, n, i, j, C(i+j-2))); \\ Michel Marcus, Dec 11 2023
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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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