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Search: id:A107600
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| 1, 18, 101, 357, 978, 2274, 4711, 8954, 15915, 26806, 43197, 67079, 100932, 147798, 211359, 296020, 406997, 550410, 733381, 964137, 1252118, 1608090, 2044263, 2574414, 3214015, 3980366, 4892733, 5972491, 7243272, 8731118, 10464639
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OFFSET
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9,2
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COMMENT
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The sequences in A089574 count ordered partitions. Sequence A001296 can be associated with 9 = 3+3+3. Six times sequence A005585, associated with 10 = 3+3+2+2. The other three sequences comprising A107600 are generated in A034261 and can be associated with 10 = 5 + 5 = 4 + 4 + 2 = 2 + 2 + 2 + 2 + 2.
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FORMULA
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G.f.: (x^5 -5*x^4 +7*x^3 +4*x^2 -11*x -1) *x^9 /(x-1)^7. [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Nov 06 2009]
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EXAMPLE
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A107600(n) can be constructed from five other sequences as follows:
1...7...25...65...140.......A001296
....1...11...56...196.......A034264
....6...42..162...462.......6.*.A005585.
....3...18...60...150.......A006011
....1....5...14....30.......A000330
therefore
1..18..101..357...978.......A107600
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MAPLE
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a:= n-> `if` (n<9, 0, (92292 +(-6580 +(-5745 +(1535 +(-147+5*n) *n) *n) *n) *n) *n /720 -218): seq (a(n), n=9..45); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Nov 06 2009]
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CROSSREFS
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Cf. A034261, A089574, A000330, A001296, A005585, A006011, A034264.
Sequence in context: A087638 A064604 A140198 this_sequence A008528 A020881 A123277
Adjacent sequences: A107597 A107598 A107599 this_sequence A107601 A107602 A107603
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KEYWORD
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easy,nonn
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AUTHOR
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Alford Arnold (Alford1940(AT)aol.com), May 17 2005
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EXTENSIONS
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More terms from Alois P. Heinz (heinz(AT)hs-heilbronn.de), Nov 06 2009
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