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Search: id:A077048
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| A077048 |
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Doubly restricted composition numbers: number of compositions of [n^2/2] into up to n positive integers each no more than n. |
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+0
4
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| 1, 1, 2, 6, 44, 350, 4292, 57036, 996088, 18661152, 424241102, 10266964015, 287927722315, 8541887839459, 285144784116376, 10016752944160536, 388044155110294856, 15749295719801313452, 694726457246902921502
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OFFSET
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0,3
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LINKS
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Index entries for sequences related to compositions
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FORMULA
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Similar in magnitude to A077045.
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EXAMPLE
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a(3)=6 since the number of compositions of [3^2/2]=4 into up to 3 positive integers each no more than 3 are: 1+1+2, 1+2+1, 1+3, 2+1+1, 2+2, 3+1.
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CROSSREFS
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Cf. A029895, A077045, A077046, A077047.
Sequence in context: A055564 A077259 A136589 this_sequence A120594 A038180 A058925
Adjacent sequences: A077045 A077046 A077047 this_sequence A077049 A077050 A077051
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KEYWORD
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nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), Oct 22 2002
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