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A108457
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Number of partitions of (n,n) into pairs (i,j) with i>0, j>=0.
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4
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1, 1, 3, 8, 23, 60, 161, 404, 1011, 2440, 5804, 13462, 30798, 69082, 152862, 333094, 716781, 1522534, 3198011, 6642274, 13657417, 27805917, 56097811, 112183092, 222496203, 437787036, 854936195, 1657526884, 3191478236, 6104379829, 11602006003, 21916355387
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OFFSET
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0,3
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COMMENTS
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(a,b)+(x,y)=(a+x,b+y); unit is (0,0).
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LINKS
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FORMULA
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EXAMPLE
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(2,2)=(1,2)+(1,0)=(1,1)+(1,1), so a(2)=3.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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