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A059135 A hierarchical sequence (S(W2{3}c) - see A059126). 1
11, 54, 161, 396, 887, 1890, 3917, 7992, 16163, 32526, 65273, 130788, 261839, 523962, 1048229 (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) = -53+2^(6+n)-21*n.

a(n) = 4*a(n-1)-5*a(n-2)+2*a(n-3) for n>2.

G.f.: -(10*x+11) / ((x-1)^2*(2*x-1)).

(End)

CROSSREFS

Sequence in context: A104291 A172495 A003867 * A213840 A110159 A309921

Adjacent sequences:  A059132 A059133 A059134 * A059136 A059137 A059138

KEYWORD

easy,nonn,more

AUTHOR

Jonas Wallgren, Jan 19 2001

STATUS

approved

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Last modified March 5 11:27 EST 2021. Contains 341823 sequences. (Running on oeis4.)