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A160413 a(n) = A160411(n+1)/4. 6
2, 1, 7, 2, 13, 3, 19, 4, 25, 5, 31, 6, 37, 7, 43, 8, 49, 9, 55, 10, 61, 11, 67, 12, 73, 13, 79, 14, 85, 15, 91, 16, 97, 17, 103, 18, 109, 19, 115, 20, 121, 21, 127, 22, 133, 23, 139, 24, 145 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

Index entries for linear recurrences with constant coefficients, signature (0,2,0,-1).

FORMULA

G.f.: x*(x^4+3*x^2+x+2) / ((x-1)^2*(x+1)^2). - Colin Barker, Mar 04 2013

a(n) = -1+(-1)^n-1/4*(-7+5*(-1)^n)*n for n>1. a(n) = 2*a(n-2)-a(n-4) for n>5. - Colin Barker, Apr 06 2013

CROSSREFS

Cf. A152978, A160117 A160411, A160417.

Sequence in context: A239155 A097411 A134929 * A295734 A197328 A136535

Adjacent sequences:  A160410 A160411 A160412 * A160414 A160415 A160416

KEYWORD

nonn,easy

AUTHOR

Omar E. Pol, Jun 13 2009

EXTENSIONS

More terms from Colin Barker, Apr 06 2013

STATUS

approved

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Last modified August 3 04:47 EDT 2021. Contains 346435 sequences. (Running on oeis4.)