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(A259260(n) + A259260(n+1)) / 2.
6

%I #5 Jun 30 2015 17:12:57

%S 4,9,16,25,16,4,9,16,25,36,25,16,25,36,49,64,81,100,64,16,25,36,49,64,

%T 81,64,36,49,64,81,100,81,64,81,100,121,144,169,196,144,64,100,144,81,

%U 36,49,64,81,64,49,64,81,100,121,144,169,144,121,100,64,81

%N (A259260(n) + A259260(n+1)) / 2.

%C All terms are squares by definition of A259260.

%H Reinhard Zumkeller, <a href="/A259602/b259602.txt">Table of n, a(n) for n = 1..10000</a>

%o (Haskell)

%o a259602 n = a259602_list !! (n-1)

%o a259602_list = zipWith ((flip div 2 .) . (+))

%o a259260_list $ tail a259260_list

%Y Cf. A259260, A000290, A086517, A259603, A259604, A259605.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Jun 30 2015