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A132084 A051717(2n). 1
1, 3, 30, 42, 30, 66, 2730, 6, 510, 798, 330, 138, 2730, 6, 870, 14322, 510, 6, 1919190, 6, 13530, 1806, 690, 282, 46410, 66, 1590, 798, 870, 354, 56786730, 6, 510, 64722, 30, 4686, 140100870, 6, 30, 3318, 230010, 498, 3404310, 6, 61410, 272118, 1410, 6, 4501770 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Essentially the same as A006954.

a(2n) + a(2n+1) = 4, 72, 96, 2736, 1308, 468, ... are multiples of 4.

LINKS

Table of n, a(n) for n=0..48.

MAPLE

C:=proc(n) if n=0 then RETURN(1); fi; if n mod 2 = 0 then RETURN(bernoulli(n)+bernoulli(n-1)); else RETURN(-bernoulli(n)-bernoulli(n-1)); fi; end;

A051717 := proc(n) denom(C(n)) ; end: A132084 := proc(n) A051717(2*n) ; end: seq(A132084(n), n=0..120) ; # R. J. Mathar, Sep 07 2009

CROSSREFS

Sequence in context: A140153 A095045 A061472 * A208880 A012009 A001800

Adjacent sequences:  A132081 A132082 A132083 * A132085 A132086 A132087

KEYWORD

nonn,frac

AUTHOR

Paul Curtz, Aug 26 2008

EXTENSIONS

Extended by R. J. Mathar, Sep 07 2009

STATUS

approved

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Last modified October 14 04:28 EDT 2019. Contains 327995 sequences. (Running on oeis4.)