Search: id:A159316
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%I A159316
%S A159316 1,1,5,61,1481,66361,5390285,803252341,224927827601,121129543555441,
%T A159316 127545238071714965,265238370995975176621,1095520296374502654008921,
%U A159316 9015241470782090221556516521,148067303294213271502974778276445
%N A159316 E.g.f. A(x) satisifies: d/dx log(A(x)) = A(2*x)^2.
%C A159316 Row 2 of array A159314.
%F A159316 E.g.f. satisfies: A'(x) = A(x)*A(2*x)^2.
%F A159316 a(n) = Sum_{i=0..n-1} C(n-1,i)*4^i*A126444(i)*a(n-1-i) for n>0 with a(0)=1.
%F A159316 E.g.f.: A(x) = G(2*x)^(1/2) where G(x) = e.g.f. of A126444.
%F A159316 E.g.f.: A(x) = F(4*x)^(1/4) where F(x) = e.g.f. of A159315.
%e A159316 E.g.f.: A(x) = 1 +x +5*x^2/2! +61*x^3/3!+1481*x^4/4!+66361*x^5/5! +...
%e A159316 Related expansions:
%e A159316 log(A(x)) = x + 4*x^2/2! + 48*x^3/3! + 1216*x^4/4! + 57600*x^5/5! +...
%e A159316 A(2*x)^2 = 1 + 4*x + 48*x^2/2! + 1216*x^3/3! + 57600*x^4/4! +...
%e A159316 A(x)*A(2*x)^2 = 1 + 5*x +61*x^2/2! +1481*x^3/3! +66361*x^4/4! +...
%o A159316 (PARI) {a(n)=local(A=vector(n+4, j, 1+j*x)); for(i=0, n+3, for(j=0, n+2, 
               m=n+3-j; A[m]=exp(intformal((A[m+1]+x*O(x^n))^(2^(m-1)))))); n!*polcoeff(A[3], 
               n, x)}
%Y A159316 Cf. A159314, A159315, A126444.
%Y A159316 Sequence in context: A115047 A028296 A000364 this_sequence A116163 A092823 
               A152031
%Y A159316 Adjacent sequences: A159313 A159314 A159315 this_sequence A159317 A159318 
               A159319
%K A159316 nonn
%O A159316 0,3
%A A159316 Paul D. Hanna (pauldhanna(AT)juno.com), Apr 19 2009

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