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Search: id:A164120
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A164120 Partial sums of A162396. +0
1
5, 7, 17, 21, 41, 49, 89, 105, 185, 217, 377, 441, 761, 889, 1529, 1785, 3065, 3577, 6137, 7161, 12281, 14329, 24569, 28665, 49145, 57337, 98297, 114681, 196601, 229369, 393209, 458745, 786425, 917497, 1572857, 1835001, 3145721, 3670009 (list; graph; listen)
OFFSET

1,1

FORMULA

a(n) = 2*a(n-2)+7 for n > 2; a(1) = 5, a(2) = 7.

a(n) = (19-5*(-1)^n)*2^(1/4*(2*n-1+(-1)^n))/2-7.

G.f.: x*(5+2*x)/((1-x)*(1-2*x^2)).

PROGRAM

(MAGMA) T:=[ n le 2 select 8-3*n else 2*Self(n-2): n in [1..38] ]; [ n eq 1 select T[1] else Self(n-1)+T[n]: n in [1..#T]];

CROSSREFS

Cf. A162396, A164053 (partial sums of A162255).

Sequence in context: A128491 A146949 A048700 this_sequence A043879 A044966 A145354

Adjacent sequences: A164117 A164118 A164119 this_sequence A164121 A164122 A164123

KEYWORD

nonn

AUTHOR

Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 10 2009

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Last modified March 19 01:26 EDT 2010. Contains 173632 sequences.


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