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A045975
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Take the first odd integer and multiple of 1, the next 2 even integers and multiples of 2, the next 3 odd integers and multiples of 3, the next 4 even integers and multiples of 4,...
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6
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1, 2, 4, 9, 15, 21, 24, 28, 32, 36, 45, 55, 65, 75, 85, 90, 96, 102, 108, 114, 120, 133, 147, 161, 175, 189, 203, 217, 224, 232, 240, 248, 256, 264, 272, 280, 297, 315, 333, 351, 369, 387, 405, 423, 441, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 561, 583, 605, 627, 649, 671, 693
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| A generalized Connell sequence.
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LINKS
| Reinhard Zumkeller, Rows n=1..150 of triangle, flattened
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PROG
| (Haskell)
a045975 n k = a045975_tabl !! (n-1) !! (k-1)
a045975_row n = a045975_tabl !! (n-1)
a045975_tabl = f 1 [1..] where
f k xs = ys : f (k+1) (dropWhile (<= last ys) xs) where
ys | even k = take k ms
| otherwise = take k $ filter odd ms
ms = filter ((== 0) . (`mod` k)) xs
-- Reinhard Zumkeller, Jan 18 2012
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CROSSREFS
| Cf. A001614, A033291.
Seen as a triangle read by rows: cf. A204558 (row sums), A005917 (central terms), A204556 (left edge), A204557 (right edge).
Sequence in context: A113862 A036277 A042960 * A058296 A022948 A025217
Adjacent sequences: A045972 A045973 A045974 * A045976 A045977 A045978
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KEYWORD
| nonn,easy,nice,tabl
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AUTHOR
| Fang-kuo Huang (gsyps(AT)ms17.hinet.net)
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu)
Keyword tabl added by Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 18 2012
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