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A059140 A hierarchical sequence (S(W2{2}*c) - see A059126). 0
4, 15, 40, 93, 202, 423, 868, 1761, 3550, 7131, 14296, 28629, 57298, 114639, 229324 (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) = 2*(-5+7*2^n)-3*n.

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

G.f.: (x-4) / ((x-1)^2*(2*x-1)).

(End)

CROSSREFS

Sequence in context: A053698 A162867 A336971 * A031164 A116600 A074033

Adjacent sequences:  A059137 A059138 A059139 * A059141 A059142 A059143

KEYWORD

easy,nonn,more

AUTHOR

Jonas Wallgren, Jan 19 2001

STATUS

approved

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Last modified March 7 13:15 EST 2021. Contains 341886 sequences. (Running on oeis4.)