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Search: id:A108457
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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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+0
3
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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
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OFFSET
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0,3
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COMMENT
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(a,b)+(x,y)=(a+x,b+y); unit is (0,0).
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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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Main diagonal of A108456. Cf. A000041, A108461.
Sequence in context: A027212 A027236 A027244 this_sequence A071618 A146998 A103819
Adjacent sequences: A108454 A108455 A108456 this_sequence A108458 A108459 A108460
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KEYWORD
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nonn
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Jun 03 2005
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