1,6

For n>0 A123640 begins

1

0 1

1 0 1 1

0 1 0 0 1 1 1 1

suppressing multiple zeros and counting contiguous ones yields

1

0 1

1 0 2

0 1 0 4

1 0 2 0 8

0 1 0 4 0 16

...

Cf. A000079 A001045 A059841 A123640.

Adjacent sequences: A123638 A123639 A123640 this_sequence A123642 A123643 A123644

Sequence in context: A111959 A110109 A067631 this_sequence A134317 A132277 A137286

more,nonn,tabl

Alford Arnold (Alford1940(AT)aol.com), Oct 04 2006