%I #16 Jan 31 2019 22:09:52
%S 1,14,688,56738,6347176,881241656,144796770004,27351977086556,
%T 5826096152426212,1380051673281134312,359720002818554238352,
%U 102317793242070983628176,31540355035889303797419616,10475792506313141986771902704,3730248479020018845292570520560,1417811189172027111629537752756520,572992474515466430293335350543824096
%N G.f. A(x) satisfies: 1 = Sum_{n>=0} ( (1+x)^n - 5*x*A(x) )^n * 2^n / 3^(n+1).
%H Paul D. Hanna, <a href="/A303288/b303288.txt">Table of n, a(n) for n = 0..50</a>
%F G.f. A(x) satisfies:
%F (1) 1 = Sum_{n>=0} 2^n * ( (1+x)^n - 5*x*A(x) )^n / 3^(n+1).
%F (2) 1 = Sum_{n>=0} 2^n * (1+x)^(n^2) / (3 + 10*x*A(x)*(1+x)^n)^(n+1). - _Paul D. Hanna_, Jan 10 2019
%F (3) 1 = Sum_{k>=0} (-5*x)^k * A(x)^k * Sum_{n>=0} C(n+k,k) * (1+x)^(n*(n+k)) * 2^(n+k) / 3^(n+k+1).
%F (4) 1 = Sum_{n>=0} Sum_{k=0..n} C(n,k) * (1+x)^(n*(n-k)) * 2^n / 3^(n+1) * (-5*x)^k * A(x)^k.
%e G.f.: A(x) = 1 + 14*x + 688*x^2 + 56738*x^3 + 6347176*x^4 + 881241656*x^5 + 144796770004*x^6 + 27351977086556*x^7 + 5826096152426212*x^8 + ...
%e such that
%e 1 = 1/3 + 2*((1+x) - 5*x*A(x))/3^2 + 2^2*((1+x)^2 - 5*x*A(x))^2/3^3 + 2^3*((1+x)^3 - 5*x*A(x))^3/3^4 + 2^4*((1+x)^4 - 5*x*A(x))^4/3^5 + 2^5*((1+x)^5 - 5*x*A(x))^5/3^6 + ...
%e also,
%e 1 = 1/(3 + 10*x*A(x)) + 2*(1+x)/(3 + 10*x*A(x))^2 + 2^2*(1+x)^4/(3 + 10*x*A(x))^3 + 2^3*(1+x)^9/(3 + 10*x*A(x))^4 + 2^4*(1+x)^16/(3 + 10*x*A(x))^5 + 2^5*(1+x)^25/(3 + 10*x*A(x))^6 + ...
%Y Cf. A301435, A303291, A323314, A323315, A323316, A323317, A323318, A323319, A323320, A323321.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Apr 23 2018