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A045430
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Number of dominoes with n spots (in standard set).
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0
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1, 1, 2, 2, 3, 3, 4, 3, 3, 2, 2, 1, 1
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OFFSET
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0,3
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LINKS
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EXAMPLE
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a(3)=2 since there are two dominoes with three spots: 2,1 and 3,0.
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CROSSREFS
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Cf. A008967 where rows are equivalent sequences for zero to n spots in each half-domino (in this standard case: 6)
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KEYWORD
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easy,fini,full,nonn
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AUTHOR
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STATUS
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approved
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