login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified June 23 21:09 EDT 2018. Contains 311812 sequences. (Running on oeis4.)