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A056921
a(0) = 0, a(1) = 1, a(2*n) = n*a(2*n-1) + a(2*n-2), a(2*n+1) = a(2*n) + a(2*n-1).
3
0, 1, 1, 2, 5, 7, 26, 33, 158, 191, 1113, 1304, 8937, 10241, 80624, 90865, 807544, 898409, 8893225, 9791634, 106809565, 116601199, 1389422754, 1506023953, 19461710190, 20967734143, 292042254049, 313009988192, 4674182088737
OFFSET
0,4
LINKS
FORMULA
Numerators of continued fraction for alternating factorial.
CROSSREFS
Cf. A058797.
Sequence in context: A106018 A188499 A215535 * A041245 A042159 A071898
KEYWORD
frac,easy,nonn
AUTHOR
EXTENSIONS
More terms from James A. Sellers, Sep 07 2000
STATUS
approved