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Search: id:A113283
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A113283 Even bisection of A113281: a(n) = A113281(2*n). +0
5
1, 3, 11, 51, 255, 1325, 7039, 37951, 206799, 1135969, 6279509, 34889553, 194664283, 1089943229, 6120967411, 34463104999, 194474062663, 1099571123853, 6227893795649, 35329149864161, 200691916063033, 1141489886332555 (list; graph; listen)
OFFSET

0,2

FORMULA

G.f.: ( (1+x)/(1-x)/(1-6*x+x^2)*(1-x+(1-6*x+x^2)^(1/2))/2 )^(1/2).

PROGRAM

(PARI) {a(n)=local(x=X+X*O(X^n)); polcoeff( ((1+x)/(1-x)/(1-6*x+x^2)*(1-x+(1-6*x+x^2)^(1/2))/2)^(1/2), n, X)}

CROSSREFS

Cf. A113281, A113282, A113284.

Sequence in context: A024335 A024336 A145144 this_sequence A127784 A112696 A132006

Adjacent sequences: A113280 A113281 A113282 this_sequence A113284 A113285 A113286

KEYWORD

nonn

AUTHOR

Paul D. Hanna (pauldhanna(AT)juno.com), Oct 22 2005

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.


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