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%I #3 Mar 20 2015 17:09:56
%S 0,0,1,5,11,31,75,91,145,225,241,319,419,599,727,949,803,1115,1353,
%T 1219,1869,2085,2285,2583,3101,4347,4683,5009,5921,5717,6467,7473,
%U 7573,8675,9423,8615,10147,10837,12797,13167,13249,14341,15321
%N a(n)=A074639(A074647(n)).
%Y Cf. A074639.
%K nonn
%O 1,4
%A Michele Dondi (bik.mido(AT)tiscalinet.it), Sep 18 2002