%I
%S 3,7,12,20,29,39,50,63,77,92,108,126,145,166,188,211,235,260,286,313,
%T 341,371,402,435,469,504,540,577,615,655,696,738,781,825,870,916,963,
%U 1011,1060,1112,1165,1219,1274,1330,1387,1445,1504,1564,1625,1687,1751
%N A bisection of A120049.
%C The other bisection is A130051; both bisections are strictly increasing.
%F a(n)=b(2n), for n>=1, where b=A130049.
%Y Cf. A130048, A130049, A130051.
%K nonn
%O 1,1
%A _Clark Kimberling_, May 03 2007
