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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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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)).
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PROG
| (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]];
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CROSSREFS
| Cf. A162396, A164053 (partial sums of A162255).
Sequence in context: A128491 A146949 A048700 * A043879 A044966 A191145
Adjacent sequences: A164117 A164118 A164119 * A164121 A164122 A164123
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KEYWORD
| nonn
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AUTHOR
| Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 10 2009
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