OFFSET
1,2
COMMENTS
Inspired by A127330.
EXAMPLE
In step 4 the numbers 2^4-1 to 2^4+4-2 are appended: 15, 16, 17, 18.
PROG
(Magma) &cat[ [2^k-1..2^k+k-2]: k in [1..11] ];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Klaus Brockhaus, Mar 31 2007
STATUS
approved