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A355082
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G.f. A(x) satisfies A(x) = 1 + x * A(4 * x / (1 - x)) / (1 - x).
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3
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1, 1, 5, 89, 5949, 1546225, 1591006901, 6526287232201, 106972340665773165, 7011394913950382306529, 1838058207026378316690626149, 1927362102757461997768349891040825, 8083963777926072174628168609626454270621
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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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a(0) = 1; a(n) = Sum_{k=0..n-1} 4^k * binomial(n-1,k) * a(k).
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PROG
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(PARI) a_vector(n) = my(v=vector(n+1)); v[1]=1; for(i=1, n, v[i+1]=sum(j=0, i-1, 4^j*binomial(i-1, j)*v[j+1])); v;
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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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