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Search: id:A108456
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| A108456 |
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Table read by antidiagonals: T(n,k) = number of partitions of (n,k) into pairs (i,j) with i>0, j>=0. |
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+0
2
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| 1, 0, 1, 0, 1, 2, 0, 1, 2, 3, 0, 1, 3, 4, 5, 0, 1, 3, 6, 7, 7, 0, 1, 4, 8, 12, 12, 11, 0, 1, 4, 10, 16, 21, 19, 15, 0, 1, 5, 12, 23, 31, 36, 30, 22, 0, 1, 5, 15, 28, 45, 55, 58, 45, 30, 0, 1, 6, 17, 37, 60, 84, 94, 92, 67, 42, 0, 1, 6, 20, 44, 80, 115, 147, 153, 140, 97, 56, 0, 1, 7, 23
(list; table; graph; listen)
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OFFSET
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0,6
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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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LINKS
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N. J. A. Sloane, Transforms
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FORMULA
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Euler transform of table whose g.f. is x/((1-x)*(1-y)).
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EXAMPLE
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1 0 0 0 0 ...
1 1 1 1 1 ...
2 2 3 3 4 ...
3 4 6 8 10 ...
5 7 12 16 23 ...
(3,2)=(2,2)+(1,0)=(2,1)+(1,1)=(2,0)+(1,2)=(1,2)+(1,0)+(1,0)=(1,1)+(1,1)+(1,0), so a(3,2)=6.
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CROSSREFS
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Cf. A108461, A108455. Columns 0-1: A000041, A000070. Main diagonal: A108457.
Sequence in context: A025691 A099173 A159880 this_sequence A089107 A117398 A071486
Adjacent sequences: A108453 A108454 A108455 this_sequence A108457 A108458 A108459
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KEYWORD
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nonn,tabl
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Jun 03 2005
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