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A225505
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a(n) = triangular(a(n-1)+a(n-2)) if n > 1, else a(n) = n.
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0
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0, 1, 1, 3, 10, 91, 5151, 13741903, 94490753712985, 4464252567106907867941273716, 9964775491460730298984873904585383048580645394630925051
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,4
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LINKS
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PROG
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(Python)
prpr, prev = 0, 1
for i in range(1, 17):
print str(prpr)+', ',
n = prpr+prev
cur = n*(n+1)/2
prpr, prev = prev, cur
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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