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A091760
0^n+3((n+2)^n/(n+3)-(-1)^n/(n+3)).
0
1, 3, 9, 63, 555, 6303, 87381, 1434891, 27272727, 589486923, 14288622513, 384034370151, 11338782475059, 364911575317383, 12716046006693165, 477070508584969299, 19174662804725408175, 822058028667720327891
OFFSET
0,2
CROSSREFS
Cf. A083063.
Sequence in context: A108557 A109285 A245165 * A144525 A276535 A228776
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Feb 03 2004
STATUS
approved