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Search: id:A144312
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| 0, 15, 55, 120, 210, 325, 465, 630, 820, 1035, 1275, 1540, 1830, 2145, 2485, 2850, 3240, 3655, 4095, 4560, 5050, 5565, 6105, 6670, 7260, 7875, 8515, 9180, 9870, 10585, 11325, 12090, 12880, 13695, 14535, 15400, 16290, 17205, 18145, 19110, 20100
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OFFSET
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0,2
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COMMENT
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a(n) = A000217(5*n).
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FORMULA
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a(n)=25*n+a(n-1)-35 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 14 2009]
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EXAMPLE
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For n=2, a(2)=25*2+0-35=15; n=3, a(3)=25*3+15-35=55; n=4, a(4)=25*4+55-35=120 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 14 2009]
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CROSSREFS
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A014105, A081266, A033585.
Sequence in context: A119138 A043192 A043972 this_sequence A062025 A119134 A119658
Adjacent sequences: A144309 A144310 A144311 this_sequence A144313 A144314 A144315
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KEYWORD
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nonn,new
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 17 2008
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