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A020945
a(2n+1) = |a(2n) - a(2n-1)|, a(2n) = a(n) + a(n-1).
4
1, 1, 0, 2, 2, 1, 1, 2, 1, 4, 3, 3, 0, 2, 2, 3, 1, 3, 2, 5, 3, 7, 4, 6, 2, 3, 1, 2, 1, 4, 3, 5, 2, 4, 2, 4, 2, 5, 3, 7, 4, 8, 4, 10, 6, 11, 5, 10, 5, 8, 3, 5, 2, 4, 2, 3, 1, 3, 2, 5, 3, 7, 4, 8, 4, 7, 3, 6, 3, 6, 3, 6, 3, 6, 3, 7, 4, 8, 4, 10, 6, 11, 5, 12, 7, 12, 5, 14, 9, 16, 7, 17, 10, 16
OFFSET
1,4
CROSSREFS
KEYWORD
nonn
STATUS
approved