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A027320
Duplicate of A027319.
0
1, 3, 8, 20, 120, 432, 1512, 5184, 17496, 58320, 192456, 629856, 2047032
OFFSET
0,2
CROSSREFS
Sequence in context: A108189 A148768 A110861 * A027319 A297973 A291176
KEYWORD
dead
STATUS
approved