A049977 a(n)=a(1)+a(2)+...+a(n-1)+a(m), where m=2^(p+1)+2-n and 2^p<n-1<=2^(p+1).

1, 3, 4, 11, 20, 50, 93, 185, 368, 920, 1748, 3453, 6876, 13743, 27479, 54957, 109912, 274780, 522082, 1030428, 2053989, 4104555, 8207405, 16413982, 32827412, 65654641, 131309190, 262618337, 525236644, 1050473279, 2100946551