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A059145 A hierarchical sequence (S(W3{2,2}*cc) - see A059126). 0
15, 54, 141, 324, 699, 1458, 2985, 6048, 12183, 24462, 49029, 98172, 196467, 393066, 786273 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..14.

J. Wallgren, Hierarchical sequences

FORMULA

Conjectures from Colin Barker, Oct 07 2015: (Start)

a(n) = 3*(-11+2^(4+n)-3*n).

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

Sequence in context: A063436 A010004 A172073 * A086643 A296324 A240814

Adjacent sequences:  A059142 A059143 A059144 * A059146 A059147 A059148

KEYWORD

easy,nonn,more

AUTHOR

Jonas Wallgren, Jan 19 2001

STATUS

approved

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Last modified March 21 07:23 EDT 2019. Contains 321367 sequences. (Running on oeis4.)