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Search: id:A117824
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| A117824 |
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a(0) = 0, a(1) = 1; for n >= 2, a(n) = a(n-1) + a(n-2) - (n-1) if that number is positive and not already in the sequence, otherwise a(n) = a(n-1) + a(n-2) + (n-1). |
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4
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| 0, 1, 2, 5, 4, 13, 12, 19, 24, 35, 50, 75, 114, 177, 278, 441, 704, 1129, 1816, 2927, 4724, 7631, 12334, 19943, 32254, 52173, 84402, 136549, 220924, 357445, 578340, 935755, 1514064, 2449787, 3963818, 6413571, 10377354, 16790889, 27168206, 43959057
(list; graph; listen)
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OFFSET
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0,3
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MAPLE
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a[0]:=0: a[1]:=1: A:={0, 1}: for n from 2 to 42 do if a[n-1]+a[n-2]-n+1>0 and member(a[n-1]+a[n-2]-n+1, A)=false then a[n]:=a[n-1]+a[n-2]-n+1: A:=A union {a[n-1]+a[n-2]-n+1} else a[n]:=a[n-1]+a[n-2]+n-1: A:=A union {a[n-1]+a[n-2]+n-1} fi: od: seq(a[n], n=0..42); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 30 2006
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CROSSREFS
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Cf. A079053, A005132, A117821, A117822, A117823.
Adjacent sequences: A117821 A117822 A117823 this_sequence A117825 A117826 A117827
Sequence in context: A073122 A084410 A080067 this_sequence A122212 A102468 A079053
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Apr 30 2006
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 30 2006
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