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A056952 Numerators of continued fraction for alternating factorial. 2
0, 1, 1, 2, 4, 8, 20, 44, 124, 300, 920, 2420, 7940, 22460, 78040, 235260, 859580, 2741660, 10477880, 35152820, 139931620, 491459820, 2030707640, 7436765660, 31805257340, 121046445260, 534514790680, 2108118579060, 9591325648580 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..28.

FORMULA

a[0]=0; a[1]=1; a[n]=a[n-1]+[n/2]*a[n-2]

a(2n) = A002793(n); a(2n-1) = A002793(n) - n * A002793(n-1). [From Max Alekseyev, Jul 07 2010]

CROSSREFS

Cf. A002793.

Sequence in context: A105319 A051389 A078006 * A225585 A121703 A275070

Adjacent sequences:  A056949 A056950 A056951 * A056953 A056954 A056955

KEYWORD

nonn

AUTHOR

Aleksandar Petojevic (apetoje(AT)ptt.yu), Sep 05 2000

EXTENSIONS

More terms from James A. Sellers, Sep 07 2000

STATUS

approved

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Last modified May 26 05:25 EDT 2017. Contains 287077 sequences.