[seqfan] Erasing... odd number

[Eric Angelini]

Hello SeqFans,

O=1,1,2,1,3,4,2,1,5,6,3,7,8,4,2,1,9,10,5,11,12,6,3,13,14,7,15,16,8,4,2,1,17,18,9,19,20,10,5,21,22,11,23,24,12,6,3,25,26,13,27,18,14,7,29,30,15,31,32,16,8,4,2,1,...

1) Underline all integers that have an odd number as left neighbour;
2) Erase all underlined integers;

... the remining integers rebuild O.

P.-S.
O is build such that the underlined integers appear in this "natural" order:
1,2,3,4,5,6,7,8,9,10,11,12,13,14,...

Best,
É.