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Search: id:A069005
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A069005 Let M = 4 X 4 matrix with rows /1,1,1,1/1,1,1,0/1,1,0,0/1,0,0,0/ and A(n) = vector (x(n),y(n),z(n),t(n)) = M^n*A where A is the vector (1,1,1,1); then a(n)=z(n). +0
1
1, 7, 19, 56, 160, 462, 1329, 3828, 11021, 31735, 91376, 263108, 757588, 2181389, 6281058, 18085587, 52075371, 149945056, 431749580, 1243173370, 3579575053, 10306975580, 29677753369, 85453685055, 246054079584, 708484485384 (list; graph; listen)
OFFSET

1,2

FORMULA

G.f.: x(-x^4-2x^3+2x^2+5x+1)/[(1+x)(1-3x-x^3)].

CROSSREFS

Cf. A018919.

Adjacent sequences: A069002 A069003 A069004 this_sequence A069006 A069007 A069008

Sequence in context: A072630 A002714 A126361 this_sequence A000413 A092359 A046137

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 02 2002

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.


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