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Search: id:A145075
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| A145075 |
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a(n) = [x^(5^n)] Q(x,n)^(n+1) where Q(x,n) = Sum_{k=0..n} (x^(5^k) + x^(2*5^k) + x^(3*5^k) + x^(4*5^k)) for n>=0. |
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+0
4
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OFFSET
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0,2
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EXAMPLE
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a(n) equals the coefficient of x^(5^n) in Q(x,n)^(n+1) where
Q(x,n) = Sum_{k=0..n} (x^(5^k) + x^(2*5^k) + x^(3*5^k) + x^(4*5^k)) for n>=0.
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PROGRAM
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(PARI) {a(n, q=5)=local(Q=sum(j=0, n, (x^(q^j)-x^(q*q^j))/(1-x^(q^j)+O(x^(q^n+1))))); polcoeff(Q^(n+1), q^n)}
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CROSSREFS
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Cf. A007178, A145073, A145074, A145076.
Sequence in context: A054759 A007153 A156870 this_sequence A058924 A154731 A071173
Adjacent sequences: A145072 A145073 A145074 this_sequence A145076 A145077 A145078
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KEYWORD
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more,nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Oct 09 2008
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