1,1

a(n) is also A152776 written in base 2.

n ... a(n) .............. A152776(n)

1 ... 111 ............... 7

2 ... 111000 ............ 56

3 ... 111000111 ......... 455

4 ... 111000111000 ...... 3640

5 ... 111000111000111 ... 29127

Cf. A043291, A153435, A152776.

Sequence in context: A078270 A015262 A145698 this_sequence A156407 A103849 A010032

Adjacent sequences: A152772 A152773 A152774 this_sequence A152776 A152777 A152778

easy,nonn

Omar E. Pol (info(AT)polprimos.com), Jan 18 2009