login
A059145
A hierarchical sequence (S(W3{2,2}*cc) - see A059126).
1
15, 54, 141, 324, 699, 1458, 2985, 6048, 12183, 24462, 49029, 98172, 196467, 393066, 786273, 1572696, 3145551, 6291270, 12582717, 25165620, 50331435, 100663074, 201326361, 402652944, 805306119, 1610612478, 3221225205, 6442450668, 12884901603, 25769803482
OFFSET
0,1
FORMULA
Conjectures from Colin Barker, Oct 07 2015: (Start)
a(n) = 3*(-11 + 2^(4+n) - 3*n) = 3*A109363(n+2).
a(n) = 4*a(n-1) - 5*a(n-2) + 2*a(n-3) for n > 2.
G.f.: 3*(2*x-5) / ((x-1)^2*(2*x-1)).
(End)
CROSSREFS
Cf. A059126.
Sequence in context: A063436 A010004 A172073 * A086643 A296324 A240814
KEYWORD
nonn
AUTHOR
Jonas Wallgren, Jan 19 2001
EXTENSIONS
More terms from Sean A. Irvine, Sep 13 2022
STATUS
approved