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For n>2, a(n) not appeared previously is such that a(n-1)^2+4*a(n-2)*a(n) is a minimal square, a(1)=1, a(2)=6.
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%I #5 Jun 17 2018 18:47:15

%S 1,6,7,3,4,15,19,8,11,10,21,13,18,16,2,5,12,9,30,24,54,33,17,26,43,28,

%T 71,39,32,55,87,46,25,66,27,93,22,56,78,23,31,114,40,74,36,38,68,106,

%U 60,166,42,124,110,14,48,62,85,58,143,86,57,29,140,169,51,118,45,52,76,128

%N For n>2, a(n) not appeared previously is such that a(n-1)^2+4*a(n-2)*a(n) is a minimal square, a(1)=1, a(2)=6.

%H Ivan Neretin, <a href="/A105831/b105831.txt">Table of n, a(n) for n = 1..10000</a>

%Y Cf. A105822, A105828-A105836.

%K nonn

%O 1,2

%A _Zak Seidov_, Apr 22 2005