A111650 2n appears n times (n>0).

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

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