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Search: id:A081556
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| 1, 2, 5, 4, 8, 6, 11, 8, 14, 10, 17, 12, 20, 14, 23, 16, 26, 18, 29, 20, 32, 22, 32, 24, 38, 26, 41, 28, 44, 30, 47, 32, 50, 34, 53, 36, 56, 38, 59, 40, 62, 42, 65, 44, 68, 46, 71, 48, 74, 50, 77, 52, 80, 54, 83, 56, 86, 58, 89, 60, 92, 62, 95, 64, 98, 66, 101, 68, 104, 70
(list; graph; listen)
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OFFSET
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2,2
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COMMENT
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If n is odd, a(n) = n-1. If n is even, n-1 <= a(n) <= 3n/2-1. For even n up to 100, a(n) = 3n/2-1 unless n = 2 or 24; are there other exceptions? - Dean Hickerson (dean(AT)math.ucdavis.edu), Mar 21 2003
Diagonal sums of A103516. - Paul Barry (pbarry(AT)wit.ie), Feb 09 2005
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FORMULA
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a(n)=sum{k=0..floor(n/2), 0^(k(n-k))*(n-k+1)} - Paul Barry (pbarry(AT)wit.ie), Feb 09 2005
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CROSSREFS
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Cf. A080504, A080505, A080506, A080507.
Sequence in context: A057954 A060710 A093052 this_sequence A033686 A134079 A080031
Adjacent sequences: A081553 A081554 A081555 this_sequence A081557 A081558 A081559
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KEYWORD
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nonn
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AUTHOR
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Dean Hickerson (dean(AT)math.ucdavis.edu), Mar 21 2003
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