1,1

a(n) is also A154806 written in base 2.

n ... a(n) ................... A154806(n)

1 ... 1111 ................... 15

2 ... 11110000 ............... 240

3 ... 111100001111 ........... 3855

4 ... 1111000011110000 ....... 61680

5 ... 11110000111100001111 ... 986895

Cf. A152775, A153435, 154806, A154807.

Sequence in context: A115802 A115812 A015292 this_sequence A066484 A151951 A027622

Adjacent sequences: A154802 A154803 A154804 this_sequence A154806 A154807 A154808

easy,nonn

Omar E. Pol (info(AT)polprimos.com), Jan 25 2009