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A366366
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G.f. satisfies A(x) = (1 + x/A(x)^4)/(1 - x).
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5
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1, 2, -6, 58, -574, 6402, -75878, 939290, -12000318, 157050178, -2094657926, 28368411194, -389079656446, 5393118559938, -75431624084838, 1063251390845338, -15088643098754942, 215396586102923138, -3091050571516120582, 44566089825496186170
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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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a(n) = (-1)^(n-1) * Sum_{k=0..n} binomial(5*k-1,k) * binomial(4*k-1,n-k)/(5*k-1).
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PROG
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(PARI) a(n) = (-1)^(n-1)*sum(k=0, n, binomial(5*k-1, k)*binomial(4*k-1, n-k)/(5*k-1));
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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