%I
%S 1,3,4,7,8,9,15,16,17,18,31,32,33,34,35,63,64,65,66,67,68,127,128,129,
%T 130,131,132,133,255,256,257,258,259,260,261,262,511,512,513,514,515,
%U 516,517,518,519,1023,1024,1025,1026,1027,1028,1029,1030,1031,1032,2047
%N Start with the empty sequence and append in step k the consecutive numbers 2^k1 to 2^k+k2.
%C Inspired by A127330.
%e In step 4 the numbers 2^41 to 2^4+42 are appended: 15, 16, 17, 18.
%o (MAGMA) &cat[ [2^k1..2^k+k2]: k in [1..11] ];
%Y Cf. A127330, A129143.
%K nonn,easy
%O 1,2
%A _Klaus Brockhaus_, Mar 31 2007
