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A183067
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G.f.: A(x) = Sum_{n>=0} (4n)!/n!^4 * x^(2n)/(1-2*x)^(4n+1).
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3
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1, 2, 28, 248, 3976, 52112, 850144, 13032896, 217878616, 3594283952, 61577419168, 1056910842176, 18485891235904, 325146542386304, 5781811796793088, 103413141115923968, 1863085674077321176, 33737014083314312624
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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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PROG
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(PARI) {a(n)=polcoeff(sum(m=0, n, (4*m)!/m!^4*x^(2*m)/(1-2*x+x*O(x^n))^(4*m+1)), n)}
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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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