OFFSET
0,2
LINKS
FORMULA
a(n) = 3*2^(n+1)*(2^(n+1)-1)*(2^(n+1)-2)/4. - Ralf Stephan, Apr 06 2004
From R. J. Mathar, May 22 2013: (Start)
a(n) = 18*A016290(n-1).
G.f.: -18*x/((8*x-1)*(2*x-1)*(4*x-1)). (End)
a(n) = 14*a(n-1) - 56*a(n-2) + 64*a(n-3). - Wesley Ivan Hurt, Mar 02 2023
MAPLE
seq(6*bernoulli(3, 2^i), i=0..24);
MATHEMATICA
6*BernoulliB[3, 2^Range[0, 30]] (* Paolo Xausa, Sep 16 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved