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 A111650 2n appears n times (n>0). 6
 2, 4, 4, 6, 6, 6, 8, 8, 8, 8, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 12, 14, 14, 14, 14, 14, 14, 14, 16, 16, 16, 16, 16, 16, 16, 16, 18, 18, 18, 18, 18, 18, 18, 18, 18, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 24, 24, 24, 24, 24, 24, 24 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Seen as a triangle read by rows: T(n,k) = 2*n, 1<=k<=n. - Reinhard Zumkeller, Mar 18 2011 LINKS Reinhard Zumkeller, Rows n = 1..128 of triangle, flattened MATHEMATICA Table[Table[2n, n], {n, 12}]//Flatten (* Harvey P. Dale, Apr 21 2018 *) PROG (Haskell) a111650 n k = a111650_tabl !! (n-1) !! (k-1) a111650_row n = a111650_tabl !! (n-1) a111650_tabl = iterate (\xs@(x:_) -> map (+ 2) (x:xs)) [2] a111650_list = concat a111650_tabl -- Reinhard Zumkeller, Nov 14 2015, Mar 18 2011 CROSSREFS Cf. A000194, A111651, A111652. Cf. A001650, A193832. Sequence in context: A191682 A113724 A161794 * A156686 A210466 A085914 Adjacent sequences: A111647 A111648 A111649 * A111651 A111652 A111653 KEYWORD easy,nonn,tabl AUTHOR Jonathan Vos Post, Aug 12 2005 STATUS approved

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Last modified September 22 23:58 EDT 2023. Contains 365532 sequences. (Running on oeis4.)