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A004197
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Table of min(x,y), where (x,y) = (0,0),(0,1),(1,0),(0,2),(1,1),(2,0),...
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6
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0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 2, 1, 0, 0, 1, 2, 2, 1, 0, 0, 1, 2, 3, 2, 1, 0, 0, 1, 2, 3, 3, 2, 1, 0, 0, 1, 2, 3, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 0, 0, 1, 2
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,13
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COMMENTS
| Row sums give A002620. - Reinhard Zumkeller, Jul 27 2005
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LINKS
| Reinhard Zumkeller, Rows n=0..100 of triangle, flattened
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FORMULA
| G.f.: x*y/((1-x)*(1-y)*(1-x*y)). - Frank Adams-Watters, Feb 06 2006
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EXAMPLE
| Top left corner of table:
0 0 0 0
0 1 1 1
0 1 2 2
0 1 2 3
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PROG
| (Haskell)
a004197 n k = a004197_tabl !! n !! k
a004197_tabl = map a004197_row [0..]
a004197_row n = hs ++ drop (1 - n `mod` 2) (reverse hs)
where hs = [0..n `div` 2]
-- Reinhard Zumkeller, Aug 14 2011
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CROSSREFS
| A003983(n) - 1.
Sequence in context: A015339 A137867 A111143 * A048571 A025880 A058755
Adjacent sequences: A004194 A004195 A004196 * A004198 A004199 A004200
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KEYWORD
| tabl,nonn,nice
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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