a(n) = a(n-1)+ [least square > a(n-1)].

Terms

a(0) =1a(1) =5a(2) =14a(3) =30a(4) =66a(5) =147a(6) =316a(7) =640a(8) =1316a(9) =2685a(10) =5389a(11) =10865a(12) =21890a(13) =43794a(14) =87894a(15) =176103a(16) =352503a(17) =705339a(18) =1410939a(19) =2822283a(20) =5644683a(21) =11290059a(22) =22586380a(23) =45177389a(24) =90362673a(25) =180726709a(26) =361467845a(27) =722962014a(28) =1445926558a(29) =2891903234